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Old 07-11-2010, 08:02 PM   #1
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Tow vehicle not charging battery

My 2010 Ford F-150 is barely charging the battery, even after 200mi+ of driving . Generator and shore power do fine as charging sources, and the battery holds a charge OK, so I'm pretty sure it's the truck. My '03 Dodge Dakota did a fine job of charging, BTW. If I take the F-150 in to check out the charging system, what should the service techs focus on? Thanks for your help!

-Jerry
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Old 07-11-2010, 09:38 PM   #2
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Some manufacturers do not install a fuse in the charge line circuit at the factory. You might want to look at the fuses in your truck.
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Old 07-11-2010, 09:42 PM   #3
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Yeah, even though delivered with a "towing package" We had to go in and insert a couple of fuses, and 1 for sure was the charging circuit.
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Old 07-11-2010, 10:46 PM   #4
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Quote:
Originally Posted by ESCAPE POD View Post
My 2010 Ford F-150 is barely charging the battery, even after 200mi+ of driving . Generator and shore power do fine as charging sources, and the battery holds a charge OK, so I'm pretty sure it's the truck. My '03 Dodge Dakota did a fine job of charging, BTW. If I take the F-150 in to check out the charging system, what should the service techs focus on? Thanks for your help!

-Jerry
Hi Jerry,
I just bought a 2010 F-150, too, and had this same exact problem with the charging circuit. When you bought your truck you should have gotten a clear plastic bag with a wiring harness for a brake controller. In that same bag you'll also find a fuse and relay. If you haven't done so already, plug these in. I believe the fuse positions are 9 and 21 (check your owner's manual).
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Old 07-11-2010, 11:46 PM   #5
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Maybe someone can clarify this for me, but does your unit as well have to he in the "in use" mode, as compared to the "storage" mode in order for the battery to charge?
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Old 07-11-2010, 11:53 PM   #6
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Maybe someone can clarify this for me, but does your unit as well have to he in the "in use" mode, as compared to the "storage" mode in order for the battery to charge?
When towing, the battery is always "in use" mode, if only to keep the fridge running. But to answer your question: yes, the battery can't charge if it is "storage" mode.

-Jerry
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Old 07-11-2010, 11:57 PM   #7
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Thanks, everyone! I found the relay and fuse in the glove box. Can I just plug them in, or do I have to disconnect the battery before doing so? If disconnected, the battery has to undergo a "relearning" process that sounds like a PITA!

-Jerry
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