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Old 08-27-2006, 05:03 PM
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electric quetion?

I have a '33 Ford street rod that's ammeter needle fluctuates all the time. The mill is a '72 Cleveland. When the lights are on they flicker with the beat of the needle. Also, the right blinker indicator light on the dash is on a little bit.
Can someone shed some light on this?

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Old 08-27-2006, 05:12 PM
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Sounds like a bad chassis ground.To do a quick check on the while its running and doing the jumping problem use a heavy gauge jumper wire or a set of jumper cables and jump from the engine block or alternator(best ground) to the neg battery post .Also most importantly run a juper to the frame and body See if any of those points help. If so just make a new chassis ground or repair the current one. An ammeter is a fire waiting to happen. I would ditch it before you smoke your car.

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Old 08-27-2006, 05:16 PM
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I can't help you on the needle fluctuation but I can on the turn indicator light. Either your right tail light or front running light is not grounded well. The power is going across the filament to the common post of the bulb. It can't find a ground there so it travels across the turn filament and up the wire for the right signal looking for a ground. It finds it there.
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Old 08-27-2006, 06:55 PM
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Doc here,

Is this One or Three wire Alternator?

Is it Internally or Externally Regulated?

Doc
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Old 08-28-2006, 05:34 AM
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Het Doc,
This is 2 wire plus ground, and it's externally regulated.
Thanks,
John
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Old 08-28-2006, 03:10 PM
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Doc here,

OK, If it's a GM Externally wired Regulator, It needs to be wired this way:



Check again and see if it isn't 3 Wires and ground..

If it Is, the Regulator may need an Air Gap Adjustment or field Coil adjustment..Or just be ready to fail..

Measure your Battery Voltage at Idle, about 5 minutes after start up to recover the high Current discharge, and let it warm up..It should read between 13.96 and 14.4 volts..If below , Add a little RPM, If it comes up, Is a good indicator that it may be ready to fail or need adjustment..

As always we assume you have checked and cleared the grounding bonding ..

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