Having problems with your 2003 Ford F250 Super Duty Crew Cab ?

Batteries won't charge while wired to truck

\015 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.\015 Posted / edited by AnonymousUser on : 22-04-2019

Answers :

Hi, seems that your alternator diodes are faulty.
\015\012You can check this by disconnecting the radio & switching off all interior lights etc.
\015\012Then remove one battery lead.
\015\012Then get an amp meter and connect it between the battery & the removed lead.
\015\012If you get a reading the alternator is drawing current , hence faulty diodes.
\015\012The alternator will still charge the battery when the engine is going but then discharges when stopped.
\015\012Also check your batteries with a hydrometer by checking the battery acid in each cell as you could have a dodgey cell in them.
Repair Help & Product Troubleshooting for 2003 Ford F250 Super Duty Crew Cab

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