Question about 2003 Ford F250 Super Duty Crew Cab

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Batteries won't charge while wired to truck

Batteries are low but charger faults out when the batteries are charged while hooked up to truck, batteries charge when isolated. After charging they will not hold charge while hooked up, truck will not turn over. Batteries are not 1 year old yet.

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Hi, seems that your alternator diodes are faulty.
You can check this by disconnecting the radio & switching off all interior lights etc.
Then remove one battery lead.
Then get an amp meter and connect it between the battery & the removed lead.
If you get a reading the alternator is drawing current , hence faulty diodes.
The alternator will still charge the battery when the engine is going but then discharges when stopped.
Also check your batteries with a hydrometer by checking the battery acid in each cell as you could have a dodgey cell in them.

Posted on Nov 28, 2008

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