Batteries Draining overnight?!?!? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 8 (permalink) Old 03-25-2011, 09:21 PM Thread Starter
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Batteries Draining overnight?!?!?

Ive been having this problem lately where my batteries will drain overnight and the truck wont start in the morning. I went and had the batteries checked and they tested good, we tested the alternator and it was toast so i replaced that and still acts the same.

What could be causing the batteries to drain like this? the battery gauge on the dash reads good the headlights don't really dim at all either, if i hook the jumper cables to it, it fires right up

Maybe a bad connection or short somewhere between the battery and alternator?? or battery and starter???

Thanks
Josh

Josh
95 F-250 ext cab lwb 4x4
custom tuned TW chip
modified H2E
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post #2 of 8 (permalink) Old 03-26-2011, 12:25 AM
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Re: Batteries Draining overnight?!?!?

You may have a short or a parasitic draw and you can check which circuit by using a 10 dc ammeter. You disconnect the negative battery cables and then hook the test leads between the negative cable and the negative battery post and read the draw. If there is a draw of 35 milliamps, or .035 amps or higher then you have a problem. First thing is to remove the alternator heavy cable to eliminate the alternator. If still a draw then remove each fuse one at a time until the draw is gone and then you found what is draining the batts.

Here is good article on this test. http://flashoffroad.com/electrical/B...teryDrain.html

96 F250 XLT 4x4 210000 miles Dana 60, Baby Swamped,Tony Wildman tunes,AutoMeter Pyro Boost Trans ,DPP downpipe,Tymar intake BTS TRANS

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post #3 of 8 (permalink) Old 03-26-2011, 01:13 AM
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Re: Batteries Draining overnight?!?!?

I have the exact same problem my batteries drain down overnight but still have enough to barley crank the truck, so I'm all ears on this one.

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post #4 of 8 (permalink) Old 03-26-2011, 01:24 AM
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Re: Batteries Draining overnight?!?!?

Quote:
Originally Posted by 1990 Scorpion View Post
I have the exact same problem my batteries drain down overnight but still have enough to barley crank the truck, so I'm all ears on this one.
Follow my recommendation

96 F250 XLT 4x4 210000 miles Dana 60, Baby Swamped,Tony Wildman tunes,AutoMeter Pyro Boost Trans ,DPP downpipe,Tymar intake BTS TRANS

e99 f350 cc/lb drw php hydra plus Tony Wildman tune


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post #5 of 8 (permalink) Old 03-26-2011, 08:50 AM
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Re: Batteries Draining overnight?!?!?

What excavator said is exactly how to find your draw on the batteries.

97 F-350 XLT CC DRW 4X4 PSD, 285/75-16 Custom bumpers, Gauges-boost/egt/trans, Swamps IDM, 3.5"dp- 4" exh., 3" Body lift, ES bushings/mounts, Built trans, billet conv, B&M pan, Hayden cooler, Adrenaline, stage 2's, IC, H2E, E-fuel
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post #6 of 8 (permalink) Old 03-29-2011, 05:15 PM
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Re: Batteries Draining overnight?!?!?

once i had that problem too and the glow plug relay it ended up being stuck. new GPR and all was well. just another thing to check out.

'96 F-250 XLT,x-cab,4x4,BTS,363k,dana60,Swamps175/173s,Dieselsite Adrenaline HPOP,CPR Fuel system,rear discs,4" dp to 6" exhaust,twin 6" stacks,Tymar, Boost Pyro Tranny and white-faced gauges,I/C,onboard air,HX mod,TW 6-position chip
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post #7 of 8 (permalink) Old 11-08-2014, 09:16 PM
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Smile Re: Batteries Draining overnight?!?!?

Okay, this is my first post and I don't have much time right now but....
I had this battery drain problem recently and found that the glow prug relay was continuing to power the plugs. I replaced relay with the White-Rodgers? part that was recommended here, I think. No fix. Then, I saw that the PCM is supposed to drop a ground after some calculated time to turn off the relay so, I removed the PCM thinking it might be the problem. I found that the cable connection to the PCM had some corrosion/oxidaton on some of the male pins and some female holes so, I cleaned them up...small wire brush on pins and a push pin in the holes. Reassembled and...problem fixed! I am a happy camper.

I hope this helps someone as I appreciate the help that I have gotten here. You guys put me on the right track. I will check back later to see if you have any questions.

Cheers,
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post #8 of 8 (permalink) Old 11-09-2014, 01:46 AM
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Re: Batteries Draining overnight?!?!?

Quote:
Originally Posted by LndCrsr View Post
I will check back later to see if you have any questions.
I would hope that after 3+ years they have figured out the battery problems.

Look at the dates on this thread....
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