[harborman]

Originally Posted by Danglerb

I would start with cleaning all of the fuse contacts, wiggle all the relays while spraying with contact cleaner, and do the normal ground service.

Maybe buy the latest best version of a loadpro or power probe. You are going to need the tricks they can do, measure voltage at any point with a slight load so enough current flows to show weak (high resistance) connections in the circuit, apply either ground or power to the probe tip.

Absolutely! You need to pull all the fuses and relays and spray contacts with Deoxit or CRC contact cleaner. Remove and clean all grounds. Check battery ground strap to frame. Check and clean ground to motor. I had to replace my ground strap on the battery (internal resistance).