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'90 240 Alternator Light is on but Battery reads +14 volts 200 1990

posted by  Rule 308 on  Sat Jun 25 19:45 CST 2005
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last visit: Tue May 8 09:20 CST 2012
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The light comes on because the small red wire at the back of the alternator is getting grounded somewhere. It could be grounded anywhere between the back of the cluster and the back of the alternator or it could be receiving it's ground from the alternator which would mean that the alternator is bad. A voltage check is not the last word in diagnosing a bad alt, it is possible to have voltage but no amperage. You need to see what the output of the alternator is in amps and find out why that red wire is going to ground somewhere.

Mark






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