Battery Light - Ford Powerstroke Diesel Forum

 
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post #1 of 8 Old 07-06-2013, 05:46 PM Thread Starter
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Battery Light

Hello: 06 f350, new batteries a month ago, truck has been starting great. Now battery light came on, tested batteries while running scan gauge reads 13.8 - 14.2, tested batteries while off both read 13.1, tested batteries while running with lights on and ac, hazard, still reads 13.8. Removed lower alternator and had it tested, failed bench test. Replaced it with new ford alternator. Truck fired right up, drove 10 minutes and battery light came on. Scan gauge still reads 14.1 . Light is driving me crazy, any thoughts....Thank you.
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post #2 of 8 Old 07-06-2013, 06:00 PM
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The battery light usually only comes on if its the batteries or alternator I believe. You said you replaced the lower alternator, what about the upper.

I cant imagine that the light would come on unless something is wrong or you have aftermarket alts. I have heard of autopart store alternators making the light stay on but you said yours was oem.

Im sure someone will help you figure it out. Are you sure you got the connector all the way on?
I recently replaced mine with a bosche from napa cause it was an emergency situation. I thought the connector was fully seated but it wasn't. It worked fine for a little bit but the connector came out enough to make the light come back on. It was a pain to get the connector fully seated. I would check that, idk

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post #3 of 8 Old 07-06-2013, 06:39 PM
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I guess have the other one tested too. Then go from there. Or just unplug the other one unless they both have to be plugged in.

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post #4 of 8 Old 07-06-2013, 06:47 PM
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Normally if both batts are good it's the alt

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post #5 of 8 Old 07-08-2013, 07:15 PM Thread Starter
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Well replaced second alternator and batt light went off. Thanks.....
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post #6 of 8 Old 07-08-2013, 10:22 PM
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Glad you got it resolved but I bet the wallet is hurting a bit.

03 F350 7.3L Auto CC LB Dually 410's (LS Rear)315's

PHP/Beans tuned, 250/100 FF inj's, BTS Tranny, Strictly Diesel complete fuel system w/RR & FB Delete, Pius LASB from Irate, Swamps hvhf IDM
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post #7 of 8 Old 07-09-2013, 01:23 AM
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Quote:
Originally Posted by INFRNL View Post
Glad you got it resolved but I bet the wallet is hurting a bit.
What he said. I supposed that's one bad thing about having a dual alt setup. Strange that both would go bad.

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post #8 of 8 Old 07-09-2013, 05:36 PM Thread Starter
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Thanks guys, finally no batt light and no money!! Gotta love our fords.
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