2016 Peterbilt 587 Electrical problems

[Nilao]

I don't have wiring diagrams and usually don't need them. Common sense and a basic understanding of electrical systems would get you far. If it only blows the fuse when you press the AC on button then it's the wire from the fuse to the compressor. Not the computer. You say it only blows if both limit switches are plugged in. I'd expect the wire after the limit switches to the compressor as I believe the compressor energize wire runs from the AC clutch relay into the low limit then into the high limit and then to the compressor on most peterbilts.

Funny story on abs lights.. I have a friend who has since retired that was always complaining the inside edges of all.4 wheel ends were cupping and his abs light would come on turning corners. I told him his wheel bearings are loose and they need to be checked. He fought this condition for a couple years. Took it to 2 different shops to have new drives put on and check the bearings. Then he blew a wheel seal a few hundred miles from my house. Long story short we found all 4 wheel ends were loose, so loose I disassembled all 4 by hand without a ratchet to release the lock nuts in the hubs. These "trained" techs couldn't be bothered to read the plastic yellow ring around the locking ring that said LMS hub, special torquing required. I asked if they had ever put a 300 ftlb torque wrench on it and he said no they tightened it and backed it off. I let him know they cost him 3 spindles and hubs. The 4th was still serviceable.

So in a nut she'll...don't trust shops.