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Bamaman39, Ford Technician
Category: Ford
Satisfied Customers: 2288
Experience:  10 years ford experience, Ford Senior Master Diesel And Gasoline Tech
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1997 f250/7.3l diesel alternator not charging how do I test.

Resolved Question:

1997 f250/7.3l diesel alternator not charging how do I test. I charge the batteries up with a battery charger to start the truck ,if I turn the heater on in the truck the batteries discharge .
Submitted: 7 years ago.
Category: Ford
Expert:  Bamaman39 replied 7 years ago.

Thank you for using just answer.


The way to check a alternator is with a volt meter.Test it at the power wire on the alternator and ground.The alternator should charge between 13.6 volts and 14.5 volts.If any lower the alternator is bad.Also wait about 1 min to test when started because it will give you a low reading when the glow plugs are still working.When the glow plugs cut off it will send the voltage back.


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