70 + voltage regulator issue

1...Make ABSOLUTELY certain the VR is grounded
2...Do the "voltage drop test." Voltage drop either in the hot or ground side causes over-charging
3....In the end run, it certainly COULD be china crap quality
4....Check out the alternator both for diode problems and for a grounded field terminal. The two field terminals should show a low resistance between them, and open / infinity to the case


How to check for drop:

1...Turn key to "run" with engine stopped. Access a point as close as you can "electrically" to the VR power / IGN terminal. This can be the blue field wire, which is switched ignition, or the key side of the ballast.

Connect one lead of your meter directly to the POS post of the battery, and the other to the IGN "run" as I just said. You are hoping for a very low voltage, lower the batter. Over .3V (3/10 of one volt) investigate why. Bulkhead connector terminals, ignition switch terminals, or in the switch itself, or ammeter circuit

2...Ground circuit. Get engine running on high idle, and run this test with all accessories off and again with lights, heater blower, etc engaged. Stab one probe into top of battery NEG post, and stab other into mounting flange of VR. Be sure to stab through chrome, paint, rust. As before you are hoping for a very low reading, zero is perfect