2005 F350 battery light - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 08-02-2014, 06:20 AM Thread Starter
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2005 F350 battery light

Howdy guys!

I've read through the list of battery light issues and none of them seem to be part of this problem.

I go out last week and turn on the truck to let the glow plugs warm up. The battery light is on solid. No other symptoms. The strange thing is that it stays lit until the engine hits operating temperature. Once it's at op temperature, the battery light goes off. It might blink every once in a while after that. Starts fine, to the battery voltage is 13.8. I've already got about $4000 into this fixing crap that has been broken or has quit.

It's a stock truck.

Thanks in advance!
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post #2 of 7 Old 08-02-2014, 06:36 AM
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Well, there is only 3 parts to the charging system...
1) Alternator
2) Voltage Regulator
3) Batteries

Two of them are in the same unit, the alternator and voltage regulator.

My suggestion is to buy a battery charger and disconnect each battery and charge them independently.

If they don't charge or the light is still on, then it's the voltage regulator.

You'll need to replace it with a MotorCraft or specialty build like DC Power.

Do Not buy any other kind, especially auto parts store brands!!!!

Also remember that if your batteries are gone, you must replace them in pairs.

Good Luck.

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post #3 of 7 Old 08-02-2014, 08:03 AM Thread Starter
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Thanks, DFuzz78!

I just thought it odd it would go off at operating temp.

Since this is a single alt, should I be looking at the HD high amp alternator from Motorcraft?
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post #4 of 7 Old 08-02-2014, 08:09 AM
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Your Welcome.

It wouldn't hurt...

Denis "Lt. Sled"
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post #5 of 7 Old 08-08-2014, 03:15 AM
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Semiconductors like those used in voltage regulators have different characteristics based on their temperature. It would not be out of the question for it to behave differently when warm. On the alternator recommendations voiced above. I'm on my 4th alt in my '04. The original made it about 5 years. I replaced it with a Motorcraft from the dealer; it's a single alt. I think that one went about 3-4 years. Bought my next one at Autozone. It went less than one year. That may or may not be the alternators fault. It died after the truck was in the shop for an unrelated problem. When we got it back several fuses were blown and the alternator wouldn't charge. I think the shop shorted something while they were working on it. The shop was kind enough to install the free replacement from Autozone without admitting guilt. I spent much less on the Autozone alt and it was replaced for free with no questions asked when it failed. Like I said, I'm at least 50% sure the shop screwed it up. Even though it was free it would be a hassle if it needed to be swapped every year. We'll see how #4 works out.
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post #6 of 7 Old 08-08-2014, 06:53 PM
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Since your in Topton Pa. Your about 30 minutes away from PA Performance, they offer a 130amp and 200amp alternator with a lifetime warranty.

http://www.pa-performance.com/Script...eries%20Pickup


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post #7 of 7 Old 08-08-2014, 06:56 PM
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I got about 30k on a napa unit. No problems yet. Even if they are very easy to change.
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