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Overcharging vs. Amp Light 120-130 1966

posted by  Phil S. on  Thu Feb 3 04:12 CST 2005
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last visit: Fri Oct 24 13:18 CST 2014
[RELATED]

Also, an overcharging system will NOT light the AMP light...that only lights if output of alt is low, not high...

Ron, for once I must disagree. About six weeks ago I noticed the amp light on my 1800 glowing dimly at cruise and getting brighter with increasing RPM. I measured the battery going over 16V by 3000 and climbing. Turned out to be a bad connection in the DF circuit internal to the alternator (Bosch 55A).

Right now I have a customer car here with a dim, but uniform, glow... it's also putting a bit over 16V across the battery (SEV, haven't troubleshot it yet).

So yes, overvoltage will bring on the warning light.






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