Ok guys this has me stumped my 125 amp alternator on my gu td42t has started to show - 3amps at idle on my redarc gauge and only shows battery’s voltage.
When I get the revs past 1100 it starts to show positive amps and normal alternator voltage of 14.2-14.4 volts.
Before this at idle it would show 0 amps and 13.2 - 14 volts.
My Hall effect sensor is on the battery wire off the b+ post of the alternator.
what could be causing this drain at idle ?
Thanks guys done all the testa on alternator and results say alternator is good.
Do I need a new alternator ?