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Old 06-21-2021, 10:19 AM   #1
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Location: Houston, TX
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Cat 330 starter wiring

Help. I need to know what wires go on the solenoid & what wires connect on side of starter (Primarily the large feed wires). I took pictures before removing but somehow they got deleted.
This is on 2003 Freightliner XC w/ Cat 330
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Old 06-21-2021, 10:56 PM   #2
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The stud on the side of the starter is a ground , so check the wires you have with an ohm meter , to see zero ohms to the frame or battery negative post , for the wires that go to starter ground stud .

The alternator power output goes to the side of the solenoid with the main power cable, and a power feed to the starter relay. Alternator ground also attached to the ground stud on the starter.

Page 4 in this pdf . For what ever reason the pages in the pdf are mixed up , look for page 4 of 6 in the lower left of the page , for the Cat starter/alternator/battery wiring .
Don't know if Freightliner was still using Denso starters in 2003 but here's pictures of my starter . Note I have added an extra wire to the solenoid activation terminal to by pass the starter relay ( that has failed twice on me ) I did repair the oil leak , but haven't got pictures with the wiring cleaned up .
I'll be under the coach doing heater hoses , so if these pictures and schematic don't help I can take better ones.
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File Type: pdf 2001 Freightliner wiring schematics.pdf (1,017.9 KB, 8 views)
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 06-22-2021, 07:14 AM   #3
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Join Date: Aug 2014
Location: Houston, TX
Posts: 106
Thanks a mil. I think that I’ll get it hooked up now. Ever since my ecm problem I’ve had nothing but frustration.
Tiffin Phaeton 40 TGH (2004)
Toad - 2015 Jeep Grand Cherokee
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cat, starter, wiring

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