Wiring harness from a G Van into a Truck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GmtGmt · 08-12-2012, 04:29 PM

How diffrent are these in these parts i have not taken apart a van so havent seen it my self

but i need a new wiring harness for the c30 diesel but its hard to finde any 81-91 trucks around here. but the G-vans are on every corner more or less and especialy in the diesel powered, so i though if i can get a good wiring harness from one of these?

ray_mcavoy · 08-12-2012, 05:50 PM

I've never really compared a C/K truck engine harness to a G van harness myself either. But from what I can tell just by looking at the wiring diagrams in the factory service manual, there are some differences.

The most obvious is the bulkhead connector where the wiring plugs in at the firewall behind the fuse box. The connector layout is slightly different and the pinout is significantly different. Also the G van has the wires for the glow plug & water in fuel indicator lights running through the bulkhead connector. While the C/K trucks have those wires on a separate plug/grommet going through the firewall.

**1774btcrew** · 08-12-2012, 06:35 PM

I would also think a big factor would be the length of the wires.

**hatzie** · 08-12-2012, 08:07 PM

What part of the harness is bad?

GmtGmt · 08-13-2012, 02:51 PM

everything some of the fuse holders are melted, alot of the wires under the dash are hacked and the engine bay is just a bad mess

i have tryed my best to fix it but its just too far gone.

**1774btcrew** · 08-13-2012, 02:56 PM

I would post a wanted ad. There should be some of the guys on here that have parted out diesels. I know of a couple at the wrecking yard.

08-12-2012, 05:50 PM	#2
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,366	Re: Wiring harness from a G Van into a Truck I've never really compared a C/K truck engine harness to a G van harness myself either. But from what I can tell just by looking at the wiring diagrams in the factory service manual, there are some differences. The most obvious is the bulkhead connector where the wiring plugs in at the firewall behind the fuse box. The connector layout is slightly different and the pinout is significantly different. Also the G van has the wires for the glow plug & water in fuel indicator lights running through the bulkhead connector. While the C/K trucks have those wires on a separate plug/grommet going through the firewall.

08-12-2012, 06:35 PM	#3
1774btcrew Senior Member Join Date: Jun 2009 Location: Phoenix AZ Posts: 4,603	Re: Wiring harness from a G Van into a Truck I would also think a big factor would be the length of the wires.

08-12-2012, 08:07 PM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Wiring harness from a G Van into a Truck What part of the harness is bad? __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

08-13-2012, 02:56 PM	#6
1774btcrew Senior Member Join Date: Jun 2009 Location: Phoenix AZ Posts: 4,603	Re: Wiring harness from a G Van into a Truck I would post a wanted ad. There should be some of the guys on here that have parted out diesels. I know of a couple at the wrecking yard.

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