I have a 1999 Ford F-250 with a 7.3 diesel. My batteries will not hold a charge. I just replaced my alternator, battery cables and cylenoid (sp.

Asked by Dec 17, 2013 at 10:56 PM about the 1999 Ford F-250 Super Duty Lariat 4WD Extended Cab LB

Question type: Maintenance & Repair

Does anyone have any idea why this is happening?

3 Answers

40

Most chances one of your two batteries is bad. If one is bad it will kill the other one. Did you disconnect both of them and test them independently of each other?

No i didn't test them independently. If that is the problem that would cause the alternator not charge the batteries? When I replaced the alternator I charged the batteries last night and started my truck and let it run for about 10 minutes I turned the headlights on and the blower motor the longer the both were on the amps would just keep dropping? I appreciate any other help.

I tested the batteries and you were right one was bad and the other wasn't in the greatest shape as well. So I replaced them both. When the motor is running and there is no load on it, the alternator is charging only 12.2 volts, and when there is a load on it the volts go down to 11.6-11.7 which it would always charge at 14.2-14.4. Any thoughts are appreciated..Thanks a bunch..

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