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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: jc74868 on November 12, 2017, 11:24:11 AM

Title: Wiring Harness Question ('78 Silverado)*SOLVED* rear lamp firewall bulkhead plug
Post by: jc74868 on November 12, 2017, 11:24:11 AM

After letting my '78 SWB Silverado sit for a couple of years, the rats got at it.  I bought a replacement in eBay. But, it turns out he didn't send all of it. It's a 3 piece thing: the bigger piece on the left has an oil sending unit, heat, alternator, starter, engine related stuff.  The middle piece is for headlights, signal lights, and then there's this piece on the far right...the piece that wasn't included and that I also need. Anyone know  what it is/what it goes to? (https://uploads.tapatalk-cdn.com/20171112/20a6c82267dec8581cfe2ffbe383eb53.jpg)(https://uploads.tapatalk-cdn.com/20171112/c3d53f2a351b1ed9728ee285abdfa195.jpg)

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Title: Re: Wiring Harness Question ('78 Silverado)
Post by: bd on November 12, 2017, 11:08:57 PM

It is the rear lamp firewall bulkhead connector and harness.  It contains left turn/brake (yellow), right turn/brake (dark green), tail/marker/license plate lamps (brown), and backup (light green).  See the 1978 Wiring Manual (http://www.73-87chevytrucks.com/techinfo/7387CKMans//Wiring/ST_352_78_1978_Chevrolet_Light_Truck_Wiring_CK_10_30_Only.pdf#page=13) for details.

Title: Re: Wiring Harness Question ('78 Silverado)
Post by: jc74868 on November 13, 2017, 10:14:28 AM

Awesome. Thanks a million

Title: Re: Wiring Harness Question ('78 Silverado)*SOLVED* rear lamp firewall bulkhead plug
Post by: bd on November 13, 2017, 02:00:38 PM

On some chassis the rear harness is in two sections.  The site store sells American Autowire harnesses.  Email Captkaos, webmaster@73-87chevytrucks.com, with what you want or need for a price and availability.