Reply to "Alternator - how do I check it?"

jfb05177Member

do you have the original charging system?
do you have a voltmeter with at least 0.1 VDC resolution?

I would get battery voltages with
1)disconnected
2)connected, but off
3)running at idle and then 2K rpm intervals without any load
4) idle and 2K intervals with as much load as you can (fans, high beams, brake)

1 and 2 should be the same
1 and 3 idle should have an increase (can't recall how much)
3/4 above idle should be greater

if voltage drops below 1 while 3/4 then absolutely no charging is happening
You can bypass the regulator and go full charge demand on the alternator to see if it is one or the other

8/23/158:20 PM

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