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2012 f350 with B10F1 code

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Old Oct 20, 2025 | 04:29 PM
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2012 f350 with B10F1 code

Friends truck, I have no history on it. Batteries went flat yesterday, they took a charge and it did start & drive. LH battery is NOT getting a charge from alternator, stays at 12.9 consistently. RH battery is getting a charge @14.xxx volts. He does have some auxiliary LEDs in his camper shell that turns out we're left on. Ran codes, got a B10F1 with a laundry list of possible fixes. Scanned with a "bluedriver" scanner. I have the scanner for "forscan" and from my tablet I have forscan lite. Before a jump thru hoops and do all the stupid pet tricks, has anyone run across this problem and might share their "forehead slap" moment? I know to eliminate the aux led lites before going any further. There's just a LOT of possibilities from the B10F1 code. What's most likely? What's easiest to sway/check? What's cheapest?
 
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