What Does A Spark Plug Do
Spark plugs can make or break your engine’s performance. Understand how they work, how to recognize a faulty one, and get expert advice on choosing the right spark plug for better engine health.
Jul 21, 2026
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Ford F-350 Spark Plug Wire
41 itemsSpark plug wires carry high voltage from the ignition coil or distributor to the spark plugs on engines equipped with separate ignition leads. Their insulated cables and boots help keep that voltage on its intended path to the plugs.
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Walker ProductsPart # 924-1663
Walker Products 924-1663 Spark Plug Wire Set
4.73 Reviews
$47.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1980-1980 Ford C600, 1980-1980 Ford C700, 1980-1980 Ford C800, 1976-1977 Ford P-500, 1976-1976 Ford P-350, 1976-1976 Ford P-400, 1975-1976 Ford Custom 500, 1975-1976 Ford Elite, 1975-1976 Ford Gran Torino, 1975-1976 Ford LTD, 1975-1976 Ford Torino, 1975-1976 Mercury Cougar, 1975-1976 Mercury Grand Marquis, 1975-1976 Mercury Montego, 1975-1975 Ford Elite, 1974-1976 Mercury Cougar, 1974-1974 Ford M-450, 1974-1974 Mercury Cougar, 1973-1974 Ford Country Sedan, 1973-1974 Ford Country Squire
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1663, 35-8196, 35-8335, 2801, 2802, 9153, 9159, JG-106,
...View moreitem #1001PP3Y
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Walker ProductsPart # 924-1400
Walker Products 924-1400 Spark Plug Wire Set
4.73 Reviews
$53.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1988-1996 Ford Bronco, 1988-1996 Ford E-150 Econoline, 1988-1996 Ford E-150 Econoline Club Wagon, 1988-1996 Ford F-150, 1988-1996 Ford F-250, 1988-1991 Ford E-250 Econoline, 1988-1989 Mercury Grand Marquis, 1987-1992 Lincoln Mark VII, 1987-1987 Ford Country Squire, 1987-1987 Ford LTD Crown Victoria, 1987-1987 Mercury Colony Park, 1987-1987 Mercury Grand Marquis, 1986-1986 Mercury Grand Marquis, 1984-1993 Ford Mustang, 1984-1987 Ford Bronco, 1984-1987 Ford E-150 Econoline, 1984-1987 Ford E-150 Econoline Club Wagon, 1984-1987 Ford E-250 Econoline, 1984-1987 Ford E-250 Econoline Club Wagon, 1984-1987 Ford E-350 Econoline
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1400, 35-8174, 35-8175, 35-8166, 2965, 2971, 9084, 8HY-2965,
...View moreitem #1001PTKS
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DensoPart # 671-8081
Spark Plug Wire Set - Denso 671-8081
51 Reviews
$61.99
Low stock: Only 4 left
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1979-1979 Ford F-100, 1978-1978 Ford E-100 Econoline, 1977-1982 Ford E-250 Econoline Club Wagon, 1977-1982 Ford E-350 Econoline, 1977-1982 Ford E-350 Econoline Club Wagon, 1977-1980 Ford E-250 Econoline, 1977-1979 Ford F-150, 1977-1979 Ford F-250, 1977-1979 Ford F-350, 1977-1978 Ford LTD, 1977-1978 Lincoln Continental, 1977-1978 Lincoln Mark V, 1977-1978 Mercury Grand Marquis, 1977-1978 Mercury Marquis
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
671-8081, 128008, 35-8169, 6718081, 96264, 700233, 16-818E, 618J,
...View moreitem #100316GL
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DensoPart # 671-8074
Spark Plug Wire Set - Denso 671-8074
51 Reviews
$61.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1986-1986 Mercury Grand Marquis, 1984-1985 Ford LTD, 1984-1985 Mercury Grand Marquis, 1983-1983 Ford LTD, 1983-1983 Ford LTD, 1983-1983 Ford Thunderbird, 1983-1983 Lincoln Continental, 1983-1983 Mercury Cougar, 1982-1983 Ford Mustang, 1982-1983 Lincoln Town Car, 1982-1983 Mercury Capri, 1982-1982 Lincoln Continental, 1981-1983 DeTomaso Pantera, 1981-1982 Ford F-100, 1980-1984 Ford Bronco, 1980-1984 Ford F-250, 1980-1983 Lincoln Mark VI, 1980-1983 Mercury Grand Marquis, 1980-1982 Ford Fairmont, 1980-1982 Ford LTD
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
671-8074, 35-8162, MSW1290, 6718074, 16-808V, 11-834M, 2X1319, QW837,
...View moreitem #1003167T
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Walker ProductsPart # 924-1445
Walker Products 924-1445 Spark Plug Wire Set
4.73 Reviews
$61.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1981-1982 Ford F-150, 1981-1982 Ford F-250, 1981-1982 Ford F-350, 1980-1982 Ford Bronco, 1980-1982 Ford E-100 Econoline, 1980-1982 Ford E-150 Econoline, 1980-1982 Ford E-250 Econoline, 1980-1982 Ford E-250 Econoline Club Wagon, 1980-1982 Ford E-250 Econoline Club Wagon, 1980-1982 Ford E-350 Econoline, 1980-1982 Ford E-350 Econoline, 1980-1982 Ford E-350 Econoline Club Wagon, 1980-1982 Ford E-350 Econoline Club Wagon, 1980-1982 Ford F-250, 1980-1982 Ford F-350, 1980-1980 Ford E-100 Econoline, 1980-1980 Ford E-250 Econoline, 1980-1980 Ford F-150, 1980-1980 Ford F-250, 1980-1980 Ford F-350
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1445, 35-8163, 2989, 9090, 26854, 35-87829, 4156, 4157,
...View moreitem #1001PQ73
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Walker ProductsPart # 924-1440
Walker Products 924-1440 Spark Plug Wire Set
4.73 Reviews
$50.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1996-1996 Ford Club Wagon, 1996-1996 Ford Econoline Super Duty, 1995-1995 Ford Club Wagon, 1988-1997 Ford F-250, 1988-1997 Ford F-350, 1988-1996 Ford Bronco, 1988-1996 Ford E-150 Econoline, 1988-1996 Ford E-150 Econoline Club Wagon, 1988-1996 Ford E-250 Econoline, 1988-1996 Ford E-350 Econoline, 1988-1996 Ford E-350 Econoline Club Wagon, 1988-1996 Ford F-150, 1988-1991 Ford E-250 Econoline Club Wagon, 1987-1989 DeTomaso Pantera
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1440, 35-8168, 2965, 9086, 26906, 35-87853, 4190, 4187,
...View moreitem #1001PU27
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Walker ProductsPart # 924-1553
Walker Products 924-1553 Spark Plug Wire Set
4.73 Reviews
$62.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2015-2015 Chevrolet Camaro, 2013-2014 Chevrolet Express 2500, 2013-2014 Chevrolet Express 3500, 2013-2013 Chevrolet Suburban 2500, 2012-2015 Chevrolet Caprice, 2012-2014 Chevrolet Suburban 1500, 2012-2012 Chevrolet Suburban 2500, 2011-2015 Ford F-250 Super Duty, 2011-2015 Ford F-350, 2011-2015 Ford F-350 Super Duty, 2011-2013 Chevrolet Silverado 3500, 2011-2013 GMC Yukon XL 2500, 2011-2013 Ram 1500, 2011-2011 Chevrolet Caprice, 2011-2011 Chevrolet Suburban 1500, 2011-2011 Ram Dakota, 2010-2015 Chevrolet Camaro, 2010-2014 Chevrolet Express Cargo, 2010-2014 Chevrolet Express Pasajeros, 2010-2014 Ford F-150
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Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1553
item #1001PSN3
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DensoPart # 671-6103
Spark Plug Wire Set - Denso 671-6103
51 Reviews
$34.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1975-1976 Ford Granada, 1975-1976 Ford Granada, 1975-1976 Ford Maverick, 1975-1976 Ford Maverick, 1975-1976 Mercury Comet, 1975-1976 Mercury Comet, 1975-1976 Mercury Monarch, 1975-1976 Mercury Monarch, 1974-1974 Ford Bronco, 1974-1974 Ford Gran Torino, 1974-1974 Ford Gran Torino, 1974-1974 Ford Mustang II, 1974-1974 Ford Mustang II, 1974-1974 Ford Mustang II, 1974-1974 Ford Mustang II, 1974-1974 Ford Torino, 1974-1974 Mercury Comet, 1974-1974 Mercury Comet, 1974-1974 Mercury Montego, 1973-1973 Ford Bronco
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Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
671-6103, 126033, 35-6188, MSW1903, 6716103, 96100, 700145, 700165,
...View moreitem #100315K4
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Walker ProductsPart # 924-1442
Walker Products 924-1442 Spark Plug Wire Set
4.73 Reviews
$54.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1984-1984 International Cargostar, 1979-1979 Lincoln Continental, 1979-1979 Lincoln Mark V, 1978-1979 Ford Bronco, 1978-1978 Mercury Grand Marquis, 1978-1978 Mercury Marquis, 1977-1979 Ford E-100 Econoline, 1977-1979 Ford E-100 Econoline Club Wagon, 1977-1979 Ford E-150 Econoline, 1977-1979 Ford E-150 Econoline Club Wagon, 1977-1979 Ford E-250 Econoline, 1977-1979 Ford E-250 Econoline Club Wagon, 1977-1979 Ford E-350 Econoline, 1977-1979 Ford E-350 Econoline Club Wagon, 1977-1979 Ford F-100, 1977-1979 Ford F-100, 1977-1979 Ford F-150, 1977-1979 Ford F-150, 1977-1979 Ford F-250, 1977-1979 Ford F-250
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1442, 35-8184, 2975, 9091, 2989, 26823, L-6140, CB227,
...View moreitem #1001PQ23
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DensoPart # 671-8089
Spark Plug Wire Set - Denso 671-8089
51 Reviews
$62.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1996-1996 Ford Econoline Super Duty, 1990-1997 Ford F-Super Duty, 1989-1997 Ford F-350, 1989-1996 Ford E-350 Econoline, 1989-1996 Ford E-350 Econoline Club Wagon, 1989-1996 Ford F-250, 1989-1991 Ford E-250 Econoline Club Wagon, 1988-1997 Ford F-53 Motorhome Chassis, 1987-1987 Ford E-350 Econoline
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
671-8089, 128018, 35-8179, 6718089, 96891, 700773, 700774, 700939,
...View moreitem #100315HP
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DensoPart # 671-8094
Spark Plug Wire Set - Denso 671-8094
51 Reviews
$58.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1979-1979 Lincoln Continental, 1979-1979 Lincoln Mark V, 1978-1979 Ford Bronco, 1978-1978 Mercury Grand Marquis, 1978-1978 Mercury Marquis, 1977-1979 Ford E-100 Econoline, 1977-1979 Ford E-100 Econoline Club Wagon, 1977-1979 Ford E-150 Econoline, 1977-1979 Ford E-150 Econoline Club Wagon, 1977-1979 Ford E-250 Econoline, 1977-1979 Ford E-250 Econoline Club Wagon, 1977-1979 Ford E-350 Econoline, 1977-1979 Ford E-350 Econoline Club Wagon, 1977-1979 Ford F-100, 1977-1979 Ford F-100, 1977-1979 Ford F-150, 1977-1979 Ford F-150, 1977-1979 Ford F-250, 1977-1979 Ford F-250, 1977-1979 Ford F-350
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
671-8094, 35-8184, MSW1291, 6718094, 16-808T, 11-832M, 2X1334, QW831,
...View moreitem #100316AH
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Walker ProductsPart # 924-1824
Walker Products 924-1824 Spark Plug Wire Set
4.73 Reviews
$71.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1978-1978 Dodge D150, 1978-1978 Dodge D400, 1978-1978 Dodge D450, 1978-1978 Dodge Magnum, 1978-1978 Dodge W150, 1977-1979 Dodge CB300, 1977-1978 Chrysler New Yorker, 1977-1978 Chrysler New Yorker, 1977-1978 Dodge D150, 1977-1978 Dodge Ramcharger, 1977-1978 Dodge W150, 1976-1978 Dodge B200, 1976-1978 Dodge B300, 1976-1978 Dodge CB300, 1976-1978 Dodge D100, 1976-1978 Dodge D300, 1976-1978 Dodge W200, 1976-1978 Dodge W300, 1975-1978 Chrysler Cordoba, 1975-1978 Dodge B200
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1824, 35-8193, 35-8319, 35-8308, 2872, 9145, 9152, 9154,
...View moreitem #1001PT0Z
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DensoPart # 671-8080
Spark Plug Wire Set - Denso 671-8080
51 Reviews
$63.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1996-1996 Ford Econoline Super Duty, 1988-1997 Ford F-350, 1988-1996 Ford Bronco, 1988-1996 Ford E-150 Econoline, 1988-1996 Ford E-150 Econoline Club Wagon, 1988-1996 Ford E-250 Econoline, 1988-1996 Ford E-350 Econoline, 1988-1996 Ford E-350 Econoline Club Wagon, 1988-1996 Ford F-150, 1988-1996 Ford F-250, 1988-1991 Ford E-250 Econoline Club Wagon, 1987-1989 DeTomaso Pantera
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
671-8080, 35-8168, 737, MSW1863, 6718080, 16-818D, 11-852M, 2X1368,
...View moreitem #100314Z4
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DensoPart # 671-8173
Denso 671-8173 Spark Plug Wire
51 Reviews
$83.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2011-2015 Ford F-250 Super Duty, 2011-2015 Ford F-350 Super Duty, 2010-2014 Ford F-150
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
671-8173
item #1004YZN8
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Walker ProductsPart # 924-1272
Walker Products 924-1272 Spark Plug Wire Set
4.73 Reviews
$39.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1976-1977 Ford P-500, 1975-1976 Ford E-100 Econoline Club Wagon, 1975-1976 Ford E-150 Econoline, 1975-1976 Ford E-150 Econoline Club Wagon, 1975-1976 Ford E-250 Econoline, 1975-1976 Ford E-350 Econoline, 1975-1976 Ford F-150, 1975-1976 Ford Granada, 1975-1976 Ford Granada, 1975-1976 Ford P-400, 1975-1976 Mercury Monarch, 1975-1976 Mercury Monarch, 1975-1975 Ford P-500, 1974-1974 Ford Mustang II, 1973-1974 Ford Bronco, 1972-1976 Ford E-100 Econoline, 1972-1974 Ford E-200 Econoline, 1972-1974 Ford E-300 Econoline, 1972-1974 Ford Gran Torino, 1971-1976 Mercury Comet
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1272, 35-6189, 35-6188, 2962, 9127, 103, 143, 9119,
...View moreitem #1001PU0H
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Walker ProductsPart # 924-1453
Walker Products 924-1453 Spark Plug Wire Set
4.73 Reviews
$59.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1988-1991 Ford LTD Crown Victoria, 1984-1987 Ford Bronco, 1984-1987 Ford E-150 Econoline, 1984-1987 Ford E-150 Econoline Club Wagon, 1984-1987 Ford E-250 Econoline, 1984-1987 Ford E-250 Econoline Club Wagon, 1984-1987 Ford E-350 Econoline, 1984-1987 Ford E-350 Econoline Club Wagon, 1984-1987 Ford F-150, 1984-1987 Ford F-250, 1984-1987 Ford F-350
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1453, 35-8167, 2965, 9086, 150, 26898, L-6217, 35-87806,
...View moreitem #1001PRZW
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Walker ProductsPart # 924-2084
Walker Products 924-2084 Spark Plug Wire Set
4.73 Reviews
$51.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2011-2015 Ford F-250 Super Duty, 2011-2015 Ford F-350, 2011-2015 Ford F-350 Super Duty, 2010-2014 Ford F-150
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-2084, 35-8353, 8845, 128046, 671-8173
item #1001PPVC
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Walker ProductsPart # 924-1397
Walker Products 924-1397 Spark Plug Wire Set
4.73 Reviews
$51.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1988-1990 Ford F-250, 1988-1990 Ford F-350, 1988-1990 Ford F-53 Motorhome Chassis, 1988-1990 Ford F-Super Duty, 1988-1988 Ford E-350 Econoline, 1983-1988 Ford E-250 Econoline Club Wagon, 1983-1988 Ford E-350 Econoline Club Wagon, 1983-1987 Ford E-350 Econoline, 1983-1987 Ford F-250, 1983-1987 Ford F-350, 1977-1978 Ford LTD, 1977-1978 Ford LTD II, 1977-1978 Ford Thunderbird, 1977-1978 Lincoln Continental, 1977-1978 Lincoln Mark V, 1977-1978 Mercury Cougar, 1977-1978 Mercury Grand Marquis, 1977-1978 Mercury Marquis, 1977-1977 Ford Bronco, 1977-1977 Ford F-100
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1397, 35-8164, 35-8178, 2971, 2977, 9083, 217, 9050,
...View moreitem #1001PUDU
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Walker ProductsPart # 924-1446
Walker Products 924-1446 Spark Plug Wire Set
4.73 Reviews
$60.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1996-1996 Ford Econoline Super Duty, 1991-1997 Ford F-350, 1991-1997 Ford F-53 Motorhome Chassis, 1991-1997 Ford F-Super Duty, 1991-1996 Ford F-250, 1989-1996 Ford E-350 Econoline, 1989-1996 Ford E-350 Econoline Club Wagon, 1989-1991 Ford E-250 Econoline Club Wagon, 1988-1990 Ford F-250, 1988-1990 Ford F-350, 1988-1990 Ford F-53 Motorhome Chassis, 1988-1990 Ford F-Super Duty
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1446, 35-8179, 2965, 9482, 3323, 8HY-3323, 26902, 35-87819,
...View moreitem #1001PTEZ
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Walker ProductsPart # 924-1396
Walker Products 924-1396 Spark Plug Wire Set
4.73 Reviews
$69.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1973-1973 Ford M-400, 1972-1974 Lincoln Mark IV, 1972-1972 Ford F-250, 1972-1972 Ford F-350, 1972-1972 Ford Gran Torino, 1972-1972 Ford P-350, 1971-1973 Ford F-100, 1971-1973 Ford F-100, 1971-1973 Ford F-250, 1971-1973 Ford F-250, 1971-1973 Ford F-350, 1971-1973 Ford F-350, 1971-1973 Ford P-350, 1971-1972 Mercury Comet, 1971-1971 Ford Country Sedan, 1971-1971 Ford Country Squire, 1971-1971 Ford Custom, 1971-1971 Ford Custom 500, 1971-1971 Ford Galaxie 500, 1971-1971 Ford LTD
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Ford F-350
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1396, 35-8194, 2801, 9165, 9167, 106, 109, 4840,
...View moreitem #1001PP8Q
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What Spark Plug Wires Do
Spark plug wires carry high voltage from the ignition coil or distributor to the spark plugs on engines equipped with separate ignition leads. Their insulated cables and boots help keep that voltage on its intended path to the plugs.
A-Premium offers wire sets for selected engines with different wire counts, lengths and connections. Match the exact application and ignition layout, then check the terminal ends and boot angles; wire diameter alone does not establish fit.
Inspecting And Replacing Ignition Wires
Heat damage, cuts or loose connections can interfere with spark delivery and contribute to misfires or rough running. Inspect the wires, boots, spark plugs and ignition components before deciding what needs replacement; similar symptoms can have other causes.
Keep each lead connected to the correct terminal and route it away from hot or moving components using the specified supports. Wire manufacturers recommend replacing leads one at a time and pulling on the boot rather than the cable. On distributor-equipped systems, also inspect the cap and distributor rotor as separate components.
Frequently Asked Questions (FAQ)
Does the number of wires always equal the number of cylinders?
The contents depend on the ignition layout: some distributor systems also use a separate coil wire. Check the selected set's listed contents and the vehicle application instead of choosing by cylinder count alone.
Why do wire length and boot angle matter?
The lead must reach the correct connection without stretching and follow a safe route around the engine. Boot shape and angle affect how it seats at the plug or coil and help it clear nearby parts.
Are spark plug wires used on every ignition system?
Some engines use individual coils mounted directly on the spark plugs with insulated coil boots instead of conventional long plug leads. Identify the installed ignition design before choosing wires or boots.
Does a thicker spark plug wire automatically improve ignition performance?
Wire diameter alone does not describe its resistance, terminals or compatibility. Choose the wire construction and specifications appropriate to the ignition system rather than assuming a larger diameter provides an upgrade.
What can damage a spark plug wire before it wears out?
A wire can be burned by nearby exhaust heat, cut by a sharp edge or damaged when the cable is pulled instead of its boot. Correct routing and secure supports help keep the replacement away from these hazards.