Battery Drain? - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 07-07-2008, 11:03 PM Thread Starter
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Battery Drain?

Ok, I have within the last 4 months replaced both batteries and my alternator. Just within the last week I have noticed that when I'm not giving my truck gas, the battery needle drops quite a bit. It is obvious at night because my headlights dim when I'm not on the gas....

What could be causing this? Any suggestions are appreciated!

Thanks -Scott


Both batteries bought from Waly World ( Seem to be just as good as Checker for half price) --Still under full warranty

Alternator Bought from Checker. --Lifetime Warranty
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post #2 of 10 Old 07-07-2008, 11:16 PM
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How's it act when the truck is off? Can you turn the headlights on when it's not running or do they dim out like that? I ask because well obviously when the truck is off, everything runs off battery. And when it's running it's ALL on the alternator (connected to batteries charging them so it uses no battery power) It could be your cables. My terminals were junk on my SuperDuty recently and the batteries drained because they weren't getting power from the alternator, the alternator actually failed a test while on the truck like that. It could still be your alternator, but since you changed the alternator AND both batteries I'd look at cables next, and/or take that alternator to a place to get it tested.

Old Truck: 00 F350 XLT DRW: basic first few mods. S&B, 4" straight pipe, gauges, CCV, EBPV and Wastegate line deletes, LED Sills, sweet custom headlights, smoked cab lights, Ventshades, Tint.
Traded in at 196k miles.

"Brand Newish" Truck: 02 Chevy S10 2.2L 5sp. Reg cab 4x2. Badass custom made shifter, foglights, 20% tint, AVS Vent-shades, Stock Intake mods, Electric Fan conversion .
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post #3 of 10 Old 07-07-2008, 11:18 PM Thread Starter
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Never thought of that trick! Thanks for the reply. First thing tomorrow morning I'll check the lights without the truck running. I'm leaning towards the cables too, but I really don't wanna mess with them...
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post #4 of 10 Old 07-07-2008, 11:19 PM
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Check the battery cables for resistance. Clean the battery terminals with wire brush, water and baking soda. Check the alternator wires and clean them as needed in the same way you clean the terminals. How old is the belt, a worn out stretched out belt can slip and cause the problem you are having.


Your Actions Today, Decide Your Future Tomorrow

2005 6.0 Crew Cab Long Box Lariat, current truck

2004 6.0 destroyed by contaminated fuel

2002 7.3L burnt
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post #5 of 10 Old 07-10-2008, 11:10 AM Thread Starter
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--UPDATE-- Ok, I cleaned all the terminals with baking soda and everything actually looks really good. Everything is connected and very tight. I tried using my lights with my truck off and sure enough they were not as bright as when the truck is revved up.

It seems the only time my battery needle is high up on the normal is when the truck is being driven. (after sitting at a stop light for 5 seconds, it slowly goes down.) If my windows are already up and I press both buttons to roll them up more, you can see the needle drop pretty bad.

I could always post a video of my battery needle. That way you guys could see how it rises and drops....??
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post #6 of 10 Old 07-10-2008, 11:20 AM
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junk batteries
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post #7 of 10 Old 07-10-2008, 11:46 AM
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junk batteries, get new ones, if those dont work then replace the alternator...if THAT doesnt work check all your fuses, actually check fuses first then go down the list
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post #8 of 10 Old 07-10-2008, 11:48 AM
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I would recommend Interstate batteries. No, they won't be the cheapest but you most likely aren't going to have to mess with them again for 4 or 5 years.
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post #9 of 10 Old 07-10-2008, 12:50 PM Thread Starter
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Quote:
Originally Posted by krazeehorse View Post
junk batteries
Hmm.. That's crappy. The only reason I went with Wal-Mart ones was because everyone on this forum said that they are just as good most others but half the price.. It doesn't hurt my feelings to replace them. They are pro-rated for like 10 years, so it will be free.
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post #10 of 10 Old 07-10-2008, 01:36 PM
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get a new alternator now..that is 99% chance of being the problem.
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