distributor headache

sherlock

New Member
I have a 1985 gmc with a 305 v8 and the distributor has a wiring harness coming out of one side with a flat plug that coonects to a harness on the truck. does anyone know what that harness controls? I put a new distributor in but it does not have that harness coming out of it and the truck runs ok.
 

theres some links and sub links with wire diagrams in this thread (near last post) that might be very useful
 
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