Question about 2002 Dodge Ram Maxi

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Check gages lite goes on alterneter gage goes to maximum

Had it checked at dealer they told me nothing wrong but it keeps coming back if i alow it to return to idle it seems to correct it for awhile but it comes back

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Check the voltage at the battery terminals
1 - when the engine is off should be 12.1V to 12.5V
2 - when the engine is idling should be 13.5V to 14.2V
3 - when the engine is revved to 2500 revs (approx is good enough)
voltage should be 14V to 14.8V

If 1 is lower, your battery is probably defective and should be tested.
if 2 or 3 is outside the ranges, the alternator is probably faulty.
NOTE The alternator test machines at Autozone etc... do not always diagnose faults. I have returned several that pass on those machines but cause faults on vehicles. especially where overcharging is the problem as those machines do not "accelerate" like a vehicle does. A poor battery could cause your problem as the alternator sometimes cannot provide enough current to maintain a charge and run the vehicle at idle. If putting your headlamps on at idle causes the gages to light the alternator is not keeping up with the charge... hope that helps...

Posted on Jan 15, 2009

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It seems one of the rectifier diod off, best to check it by osilloscope, but firs check drivebelt.

Posted on Jan 15, 2009

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