Irritating electrical problem

[MikeB]

Originally Posted by Maddog53

I'm thinking the gang plug that goes into the back of the instrument panel carries a ground.... Maybe that connection with the printed circuit floppy is bad ...or the surrounding trace has been compromised as you commented.

If adding ground straps doesn't solve the problem, Those printed circuits are reasonable priced.

As for the ground straps, I like to use external star washers on both sides of the bolt head to cut into the metal surfaces. Also, clean the bolt hole threads as best you can.

[Maddog53]

Originally Posted by MikeB

As for the ground straps, I like to use external star washers on both sides of the bolt head to cut into the metal surfaces. Also, clean the bolt hole threads as best you can.

Brilliant! Thank you!!!

[71CHEVYSHORTBED402]

Originally Posted by MikeB

If adding ground straps doesn't solve the problem, Those printed circuits are reasonable priced.

As for the ground straps, I like to use external star washers on both sides of the bolt head to cut into the metal surfaces. Also, clean the bolt hole threads as best you can.

Pretty sure the factory installed them with star washers as described. But to my knowledge, only where the straps attach to the frame rail, hmm. Good idea, especially if there's a coating on the underbody that you're not prepared to remove. Perhaps not at the firewall and valve covers.

Seems they installed a star washer for the ground wire to fender, located on the negative cable terminal for side mounts, FWW.

And FWW, I used a pilot brush for every hole, short the valve covers and firewall. Really great finishes, and everything works. I suspect a frame can be so rusty the connections have to be cleaned.