As I already posted below..."Its the voltage at/on the battery that really matters NOT the open unloaded output of the genny"
The BAT terminal on the VR is basically battery voltage (if alls wired right)
The ARM/GEN terminal on the VR is basically the output of the Genny (IF ALL WIRED CORRECT).
However, if the VR is working once the gennys voltage exceeds battery voltage (like the 15 you mentioned) the cutout relay should close which essentially connects BAT and GEN/ARM together,.
Is this a 3 terminal (BAT ARM FLD) VR or a 4 terminal (BAT ARM FLD LOAD) VR ????
If its a 4, often GEN/ARM is off on one side or the bottom all by itself, while BAT LOAD and FLD are together... SURE ITS WIRED CORRECT????? IS IT A 3 OR 4 TERMINAL VR???
You need to see if its a 3 or 4 terminal VR and then see if its wired correct and then MEASURE BATTERY VOLTAGE and see whats happening. You may just be measuring the open unloaded output of the genny when it needs to be wired correct and then measure the battery voltage!!!!!!!!!!
Did you Polarize the Genny before start up???
Heres correct wiring:
BAT on VR to ammeter FLD on VR to FLD on Genny ARM/GEN on VR to ARM on Genny (L)OAD on VR to light switch (if it has L )
I may be gone later but will check in when I return or the other good gents can get you going
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