I have a 610 with an internal regulator. New battery and wiring harness. It is backfeeding and draining my battery. It's overcharging. Does anyone have an ideas Virgil
You've got something hooked up wrong, somewhere, on your new harness install, or your alternator is bad. I'd get a schematic and double-check all the connections.
You may need a diode in-line to one of your alternator terminals if it is a Delco with a internal regulator (terminal 1 or 2) I will look at mine tomorrow and tell you which one