Hey guys, so the other day I removed my driver side fender and noticed a little shade-tree wiring done by someone that was not me.

There’s a very thin factory wire (blue/orange tracer) that appears to have—at one point—gone from the main harness from PCM all the way the through to AC/Clutch relay. Well, it was just snipped about 2” short of the relay, and the remaining wire was butt-spliced with a random, thicker yellow wire that runs across the firewall harness where it is butt-spliced with a brown wire that runs (along with 2 blue wires) into the connector for what I can only find to be the heater/AC cycle switch or suction switch.

What are the benefits of doing this to the truck? Or is there a common gremlin they were bypassing? Any help would be appreciated.

1993 D-250

 

I'd recommend getting a FSM (Factory Service Manual) so you can diagnose wiring issues more easily. If I had to wager a guess I would think maybe the AC relay stopped working and instead of diagnosing the problem and fixing it properly they just tried to bypass directly to get the AC working?

 

Why don't you read your other post