Going crazy with new Duster and over voltage issue.

67Dart273 said
OK the voltage you measure--whatever it is--ADDS to the VR setpoint. So "let's say" that after warming up, the VR is at 13.8. That .65 adds to the VR setpoint and "in theory" (and if there is no drop in the ground side) the VR will run the battery to 13.8 + .65 = 14.45. Now that is not "terrible" and if that is true there might be something else wrong. The VR might be out of spec which is not common but can happen. There MIGHT be drop right at the VR terminals/ connector. If you order yourself a rifle cleaning brush for .177 (bb gun/ pellet size) that will fit inside those connector terminals.

THE OTHER issue that might be happening here is that the drop MAY BE CHANGING that is "say" a bad terminal in the bulkhead connector, movement from you removing/ checking/ re inserting the connector may have changed the problem. Vibration/ movement may change it, and if it's in the ignition switch just wiggling the key migiht change "the problem"

Thanks for the help. So I didnt like the small ground from battery negative cable to front core support so i put another short battery ground from engine block to firewall. I also ditched the old china crap VR and went and bought a mopar performance VR. After looking at everything it appears the hack that was working on this car before i bought it put a 10 gauge wire front the alternator output directly to the starter relay to battery with no fuse or fusible link. After all that, with the engine warm it now is charging at 14.3 volts. I can live with that for now until i have more time to locate the small voltage drop in system. I think the battery got damaged from the overvoltage because when i turn the engine off the battery voltage will be at 14 volts and then slowly drop down to 13.3. I know theres a surface charge but that seems pretty high?