Pete 389 weird electrical glitch?

dirthaller · Aug 1, 2025

D.Tibbitt said: ↑

Maybe another place to check is. The cab grounds, specifically the one that grounds the cab to the engine block. On my 389 it goes to a lug near the starter.. I had a lot of weird glitches with the dash, a lot of weird symptoms that made it seem like computer was going our. Long story short after many hours of frustration, @Goodysnap pointed me in the direction of the cab grounds and that's wat it ended up being. Might. Be a good place ti look if u keep having problems in the future
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I removed my cab ground terminals and cleaned them all up last year. They had that white salty looking corrosion thing going on. Didn’t look too bad until I removed the nut to disconnect the ground wires.

balliworld · Apr 26, 2026 at 4:18 PM

dirthaller said: ↑

I removed my cab ground terminals and cleaned them all up last year. They had that white salty looking corrosion thing going on. Didn’t look too bad until I removed the nut to disconnect the ground wires.
Click to expand...

Hi, did you find out what was wrong? I am having issue as soon as i turn ignition in on position all lights on truck and trailer goes on and all switches inside truck stops working. I can not use axle lock , drop suspension , engine fan , light switchs everything stops working but all spare switches are working . Please help if someone knows anything about this. Thanks in advance.

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