73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => Electrical => Topic started by: 81c1500 on April 15, 2017, 01:19:25 pm

Title: Random firewall plug
Post by: 81c1500 on April 15, 2017, 01:19:25 pm

I'm trying to figure out what this plug is for. I picked up this gmc c1500 for $200 and now I'm trying to go through everything and fix it up.

Title: Re: Random firewall plug
Post by: bd on April 15, 2017, 01:42:45 pm

Welcome to the site!

That's the electronic spark control (ESC) connector that runs to the ESC module behind the passenger side dash.  If a short harness and mating connector is missing from the distributor, the ESC has been eliminated and the pictured plug can be disregarded.

Title: Re: Random firewall plug
Post by: 81c1500 on April 15, 2017, 05:58:30 pm

OK thanks. Yeah I noticed what appeared to be a computer under the dash on the passenger side. Truck was originally a 305 but someone swapped in a 350 which has the one wire distributor.