Hei conversion troubleshooting

There are several possibilities not in order

1...VR could be bad, not common on solid state but could certainly be true of the mechanical

2..Battery could have a problem, also rare

3...Ground path drop as I already addressed earlier

4.. Wiring harness drop as already addressed

If you have checked the ground drop, and if you have checked and eliminated the harness drop, then the next thing is a tossup. Either try a good know battery if you have one handy, or replace the VR

The bottom line is that the VR MUST see exact battery voltage. Harness drop and ground path drop are the usual suspects.