I've never used a volt gauge before this truck so I am not sure how they should be reading when tapping the full voltage at the gauges before the limiter.....
Do you know how the IVR works? It's a clicker type regulator that uses the current passing thru it to heat up a bimetallic trip that cycles the load (gauges) on and off, you pick a poor source for your voltmeter as it is seeing that load clicking on and off.
Did you ever get a reading at the voltage regulator sense voltage? I didn't see it in the thread. I suspect it is low.
