Battery Measures 15.5 vdc

ANOTHER test you should make is for voltage drop on the GROUND side of the system. The VR MUST be grounded to the battery to be accurate. To do this, measure first with engine running "fast" to simulate cruise RPM, with all accessories off, and again with heater, lights, etc all powered on.

Stab one probe into the mounting flange of the VR. Stab the other probe into the top of the battery NEG post. As in the first test, the lower the reading the better, zero is perfect.

One way to achieve a good battery--to engine--to body ground is to buy a short "starter" cable..........eye to eye.........and bolt to the rear of the drivers side head. Bolt the other end to a good bolt and nut through the firewall, or to the master cylinder mounting stud.

Remove VR, scrape around bolt holes, and remount tight with star lock washers. BOTH the VR and the Mopar ignition box MUST be grounded to operate