Question about 2003 Ford F350 Super Duty DRW SuperCab

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Alternator will intermittently not charge battery and then all of a sudden just turn on. however on a couple of instances battery has run down completly dead. have tried new alternator and same problem continued-

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The first thing to check is that the belt is not slipping and that the belt tensioner is working properly. The next thing that I would consider is a short in the alternator output wiring. My nephew had a similar intermittent charging problem and one of the wires was shorting out in the plug at the alternator. I was able to isolate the problem by checking alternator output while moving around the wiring (gently). While doing this, the output would drop, and I was able to narrow down which wire was causing the problem. It was shorting out in the plug. I resoldered the wire into the plug and that solved the problem. Not saying that this is the case in your situation, but the symptoms are similar. Really sorry for your trouble and I hope this helped. Best wishes.

Posted on Sep 30, 2009

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Sounds like a bad alternator. Drained your battery and when you turned on the lights it took all the power left in your battery. When you drain a battery down that far, they are real hard to jump, and coupled with the alternator, the car is not producing enough current to start and stay running.

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