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Old 02-24-2008, 11:09 PM
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Need help with alternator - ammeter problem on my 1947 Chev truck

Hi Folks:

Wondering if anyone can help me with this issue. Am in the process of rewiring my 1947 Chev truck with 235 CID motor. Am converting from 6V to 12V complete with an alternator. Today a friend and I did the final hookup between the alternator and ammeter and fired the truck up. It started and ran well, and the alternator was determined to be charged. However, no movement was indicated on the ammeter. We changed the wires from side to side on the ammeter but still no change.

Any help and/or suggestions would be most appreiciated.

Thank you.

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Old 02-25-2008, 01:18 AM
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Itīs a good idea to dump the AMP gauge.
Hereīs some more information on voltmeters over amp.
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Old 02-25-2008, 01:48 AM
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Use a meter tester or hook up a lamp bulb on one side of the live or earth to check for continuity....The ammeter might be burnt out....Oh yeah...jog your own memory eh?..he..he...
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Old 02-25-2008, 04:51 PM
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I have a '75 GMC truck with a factory ammeter. I've checked connections several times, but never gotten it to work. I gave up on the troubleshooting and installed a separate voltmeter.

My OEM ammeter is not a full flow ammeter, where the entire output goes through the gauge. It uses shunt arrangement, where the gauge is using two harness connections to calculate the flow, not measuring it directly.

In a '47 truck I would guess the stock gauge to be a full flow ammeter, which is not the safest wiring arrangement if you have installed a higher output alternator. I'd just switch it over to a volt meter and forget about the amp gauge for now.

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