2002thunderbird alt light

Asked by GuruTP7VV Jul 13, 2018 at 10:04 PM about the 2002 Ford Thunderbird RWD

Question type: Maintenance & Repair

The amp light comes on when the light or ac are on or speedos over 40mp.l
check the battery and the altinator whit a multimeter battery was 12.5 with
engine running it reads 14.8

1 Answer
42,950

Hornet_2497 answered 5 years ago

Your amp light is telling you the alternator is not putting out power to keep the voltage up around 12 volts with accessories on. I see it tests okay while parked. But you have to duplicate the conditions that make the amp light come on. So with the motor running fast idle, in Park, lights on, A/C and fan on, check the voltage and also see if the amp light comes on. If the amp light comes on, it means the battery is doing most of the work and the alternator is not keeping up. Have alternator tested.

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