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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: SJSbackyard on December 18, 2017, 08:28:42 am

Title: Where should this Tan/White Wire Connect?
Post by: SJSbackyard on December 18, 2017, 08:28:42 am

Recently purchased 1987 3500 High Sierra, 350cid, w/TBI. Just forward of the TBI, there's a tan/white wire that is not connected. I'm hoping someone can identify where, in the fuel related system, it should be connected. I have attempted to attach a photo showing the wire (colored arrow).

The issue I'm working on is to solve a cold start problem...

Title: Re: Where should this Tan/White Wire Connect?
Post by: Captain Swampy on December 20, 2017, 09:37:02 am

If no one answers I'll try to look tonight or tomorrow.

Title: Re: Where should this Tan/White Wire Connect?
Post by: SJSbackyard on December 20, 2017, 01:11:32 pm

Thank-you.

I tested and found continuity between the tan/white wire forward of the TBI, and the fuel pump relay (firewall). They're certainly within the same circuit. I next checked for voltage...none...appears as a ground. I really don't like to have a stray wire left, as I'm currently installing two fuel tanks and pumps.

Title: Re: Where should this Tan/White Wire Connect?
Post by: bd on December 20, 2017, 02:13:46 pm

(http://forum.73-87chevytrucks.com/smforum/index.php?action=dlattach;topic=35979.0;attach=38109;image)

Circuit 551, Tan/Wht:  ECM ground connected to intake manifold stud adjacent to thermostat housing.  See the 1987 Wiring Manual (http://www.73-87chevytrucks.com/techinfo/7387CKMans//Wiring/ST_350_87_1987_Chevrolet_GMC_Light_Truck_Wiring_Manual_Complete_11x17.pdf#page=172), grid Q43.

Title: Re: Where should this Tan/White Wire Connect?
Post by: SJSbackyard on December 21, 2017, 05:21:26 am

Thank you "bd"

Another loose-end taken care of...  ;)