2003 Peterbilt 378 Alternators
Save up to 40% on original replacement 2003 Peterbilt 378 Alternators. Navigate our online catalogue to find Alternators and other parts designed specifically to fit a 2003 Peterbilt 378.
Alternator
$379.03
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 12.5L 763ci6;
Engine Base: 12.5L 763ci6;
Vehicle Fitment Notes:
Caterpillar C13 Optional Replacement
Caterpillar C13 Optional Replacement
Alternator
$379.03
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Vehicle Fitment Notes:
Optional Replacement
Optional Replacement
Alternator
$385.78
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 12.5L 763ci6;
Engine Base: 12.5L 763ci6;
Vehicle Fitment Notes:
Caterpillar C13 Optional Replacement, Bosch IR/IF 12V 200A CW Without Pulley
Caterpillar C13 Optional Replacement, Bosch IR/IF 12V 200A CW Without Pulley
Alternator
$385.78
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Vehicle Fitment Notes:
Optional Replacement, Bosch IR/IF 12V 200A CW Without Pulley
Optional Replacement, Bosch IR/IF 12V 200A CW Without Pulley
Alternator
$544.50
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 12.5L 763ci6;
Engine Base: 12.5L 763ci6;
Vehicle Fitment Notes:
Caterpillar C13 Leece Neville 2500J IR/EF 12V 130A BI WO/ Pulley
Caterpillar C13 Leece Neville 2500J IR/EF 12V 130A BI WO/ Pulley
Alternator
$544.50
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Vehicle Fitment Notes:
Leece Neville 2500J IR/EF 12V 130A BI WO/ Pulley
Leece Neville 2500J IR/EF 12V 130A BI WO/ Pulley
Alternator
$406.69
Limited Stock
Ships: in 3-4 Business Days
Pick-Up: in 3-4 Business Days
Pick-Up: in 3-4 Business Days
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 12.5L 763ci6;
Engine Base: 12.5L 763ci6;
Vehicle Fitment Notes:
Caterpillar C13 Leece Neville 2800J IR/EF 12V 160A CW WO/ Pulley
Caterpillar C13 Leece Neville 2800J IR/EF 12V 160A CW WO/ Pulley
Alternator
$406.69
Limited Stock
Ships: in 3-4 Business Days
Pick-Up: in 3-4 Business Days
Pick-Up: in 3-4 Business Days
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Vehicle Fitment Notes:
Leece Neville 2800J IR/EF 12V 160A CW WO/ Pulley
Leece Neville 2800J IR/EF 12V 160A CW WO/ Pulley
Alternator
$366.81
Limited Stock
Ships: in 3-4 Business Days
Pick-Up: in 3-4 Business Days
Pick-Up: in 3-4 Business Days
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 12.5L 763ci6;
Engine Base: 12.5L 763ci6;
Vehicle Fitment Notes:
Caterpillar C13 Delco 22SI IR/EF 12V 130A CW WO/ Pulley
Caterpillar C13 Delco 22SI IR/EF 12V 130A CW WO/ Pulley
Alternator
$366.81
Limited Stock
Ships: in 3-4 Business Days
Pick-Up: in 3-4 Business Days
Pick-Up: in 3-4 Business Days
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Vehicle Fitment Notes:
Delco 22SI IR/EF 12V 130A CW WO/ Pulley
Delco 22SI IR/EF 12V 130A CW WO/ Pulley
Alternator
$304.18
In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 12.5L 763ci6;
Engine Base: 12.5L 763ci6;
Vehicle Fitment Notes:
Caterpillar C13 Delco 22SI IR/EF 12V 145A CW WO/ Pulley
Caterpillar C13 Delco 22SI IR/EF 12V 145A CW WO/ Pulley
Alternator
$304.18
In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Vehicle Fitment Notes:
Delco 22SI IR/EF 12V 145A CW WO/ Pulley
Delco 22SI IR/EF 12V 145A CW WO/ Pulley
Alternator
$374.18
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 12.5L 763ci6;
Engine Base: 12.5L 763ci6;
Vehicle Fitment Notes:
Caterpillar C13 Motorola 8LHA IR/EF 12V 160A BI WO/ Pulley
Caterpillar C13 Motorola 8LHA IR/EF 12V 160A BI WO/ Pulley
Alternator
$374.18
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 12.5L 763ci6;
Engine Base: 12.5L 763ci6;
Vehicle Fitment Notes:
Caterpillar C13 Motorola IR/EF 12V 130A BI WO/ Pulley
Caterpillar C13 Motorola IR/EF 12V 130A BI WO/ Pulley
Alternator
$374.18
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Vehicle Fitment Notes:
Motorola 8LHA IR/EF 12V 160A BI WO/ Pulley
Motorola 8LHA IR/EF 12V 160A BI WO/ Pulley
Alternator
$374.18
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Vehicle Fitment Notes:
Motorola IR/EF 12V 130A BI WO/ Pulley
Motorola IR/EF 12V 130A BI WO/ Pulley
Alternator
$392.61
In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 12.5L 763ci6;
Engine Base: 12.5L 763ci6;
Vehicle Fitment Notes:
Caterpillar C13 Delco 35SI IR/EF 12V 135A BI WO/ Pulley
Caterpillar C13 Delco 35SI IR/EF 12V 135A BI WO/ Pulley
Alternator
$392.61
In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Vehicle Fitment Notes:
Delco 35SI IR/EF 12V 135A BI WO/ Pulley
Delco 35SI IR/EF 12V 135A BI WO/ Pulley
Alternator
$453.37
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 12.5L 763ci6;
Engine Base: 12.5L 763ci6;
Vehicle Fitment Notes:
Caterpillar C13 Delco 36SI IR/EF 12V 170A BI WO/ Pulley
Caterpillar C13 Delco 36SI IR/EF 12V 170A BI WO/ Pulley
Alternator
$453.37
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Vehicle Fitment Notes:
Delco 36SI IR/EF 12V 170A BI WO/ Pulley
Delco 36SI IR/EF 12V 170A BI WO/ Pulley
Alternator
$319.83
In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 12.5L 763ci6;
Engine Base: 12.5L 763ci6;
Vehicle Fitment Notes:
Caterpillar C13 Delco 24SI HP IR/IF 12V 160A CW WO/ Pulley
Caterpillar C13 Delco 24SI HP IR/IF 12V 160A CW WO/ Pulley
Alternator
$319.83
In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Vehicle Fitment Notes:
Delco 24SI HP IR/IF 12V 160A CW WO/ Pulley
Delco 24SI HP IR/IF 12V 160A CW WO/ Pulley
Alternator
$1,222.58
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 12.5L 763ci6;
Engine Base: 12.5L 763ci6;
Vehicle Fitment Notes:
Caterpillar C13 Leece Neville IR/EF 12V 320A CW
Caterpillar C13 Leece Neville IR/EF 12V 320A CW
Alternator
$1,222.58
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Engine Base: 14.9L 6Cyl L (-)(912) 5.39 137.0(Bore)6.65 169.0(Stroke);
Vehicle Fitment Notes:
Leece Neville IR/EF 12V 320A CW
Leece Neville IR/EF 12V 320A CW