 Charging Issue?, I'm terrible at solving electrical problems |
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| sdoolin |
 Apr 25 2026, 11:05 AM
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Member  Group: Members Posts: 421 Joined: 1-May 14 From: LouKY Member No.: 17,299 Region Association: None  |
Voltmeter shows between 10V - 12V at idle (and everywhere else). Voltmeter drops to 10V when headlights, flashers, and wipers switched on. Multimeter across the battery terminals at idle reads 12.5V.
Alternator was verified good several years back when I built this engine. I'm not sure what to check next? |
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| sdoolin |
Apr 25 2026, 11:56 AM
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#2
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Member Group: Members Posts: 421 Joined: 1-May 14 From: LouKY Member No.: 17,299 Region Association: None |
OK, so I checked some more things, and I am NOT GOOD with a multimeter. But, here's what I found (all measurements at idle):
Battery = 12.5V Green Wire from alternator and chassis ground = 4.5V Brown wire from alternator and chassis ground = 0.05V (essentially 0) Red wire from alternator and chassis ground = 13.8V |
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Posts in this topic
sdoolin Charging Issue? Apr 25 2026, 11:05 AM
mgphoto
Voltmeter shows between 10V - 12V at idle (and ev... Apr 25 2026, 11:30 AM
fixer34
OK, so I checked some more things, and I am NOT G... Apr 25 2026, 03:35 PM mgphoto 13.8 your alternator looks to be ok but your batte... Apr 25 2026, 02:58 PM sdoolin Battery is virtually new, and lives on a trickle c... Apr 25 2026, 04:13 PM mgphoto
Battery is virtually new, and lives on a trickle ... Apr 25 2026, 06:25 PM 930cabman Is the voltage in the 13.5 - 15v when running?
I... Apr 25 2026, 06:31 PM |
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