Looking for some thoughts on this, 500 hours on tripac evolution, apu alternator sending 16 volts and cooked my year old batteries, I replaced them and the alternator was tested and replaced under warranty. Last night I'm watching TV and my xantrex inverter starts screaming, I checked and showed 16 volts shut off the apu (it wasn't throwing a code). Verified at the batteries with multimeter, yup vr toasted again.
Grounds seem to check out alright, truck alternator runs 13.8-14.0, all fuses and sense wire are ok.
Related issue, I have hydraulic doors on my trailer, the pump pulls power hard enough that the apu would sense low voltage and start. It does not do that anymore.
I do run a hard load on the apu for short periods 1300 watt max induction hot plate, about 1 minute then dropping to about 450 watts for a few minutes. Apu is 65 amp, 14.5 volt max.
Is it possible to burn out the vr with too high of a load, and would that be enough to do it
Second voltage regulator burned out
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Rounded_nut, Aug 4, 2019.
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