alternator problems on 1990 Ford Mustang GT

how do i tell if the alternator is working

by in Chino Hills, CA on November 12, 2010
3 answers
ANSWER by on November 12, 2010
put a voltmeter on the battery with the motor running. it should be between 13.7 and 14.5 volts. any lower and you may have a failure. Roy
ANSWER by on November 12, 2010
On most cars all you have to do is unhook the positive side of the battery when the car is running. If it dies the alternator is not working. If it is not working your battery will just run out of juice, no light, no start.
ANSWER by on November 12, 2010
Check the voltage at the battery, you can do it with the lights on to see if it holds under load. DO NOT REMOVE THE CABLES WHILE THE ENGINE IS RUNNING! This worked on older cars but ones with computers are sensitive to voltage spikes wich you will get if you remove a cable while its running. Steve
Related Items:
My "Check Charging System" light went on. On the way home all of a sudden the eadhlights started flashing, cd player st...
Was told I need a new alternator.
Just bought this car 2 months ago. had some burnt looking wires. when I replaced the green and yellow to the alternator and put on a new plug the battery light came on and nows stays on. now a new ...
I was leaving a store with my family around lunch time the battery light came on when i got on the highway the light went out but came back on at a redlight. The alternator was replaced twice last ...
Fixed alternator in car and warning light is still on. Is the alternator faulty or does warning need reset.

Related Content