Looking for all good tricks to find Electrical Gremlins.  My voltage as read from my hand held gps will drop from 13.7 to 12.6 for a few seconds.  My encoder does not want to work at anything under 13.7. I just had the electric gear breaker trip  at end of  retract, had up light.   My electronic guru says bad grounds or bad circut brakers. My ammeter used to work much better.  1970 E with new zeftronics VR changed after my overvoltage would trip.  No overvoltage problems since unless that is wha