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Old 01-13-2013, 09:45 AM
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Battery draw down

Gentlemen, I have a 2005 dually that I bulletproofed one year ago. 77,000 mile with a Juice attitude set on the mileage setting. I live in central Ohio and as it got colder starting was a pain. Had the batteries replaced two weeks ago and it started like a charm. Now, the starting is back to being hard, and the batteries are drawing down over night. This morning they were at 75% at 60 degrees. Last week at 30 degrees they went down to 55 %. Any thoughts on where or what is drawing down the batteries after less than 24 hours??? Charging system checked out off the scale. Is it the Juice??? Please give me some Ideas!!! Thanks POOP
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Old 01-14-2013, 06:38 AM
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What are your normal driving habits? Please check battery voltage a few minutes after you first shut it off, again in the morning before starting, and again while running after it's warmed up.

What batteries did you put in it?
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Old 01-14-2013, 08:04 AM
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Charge your batteries individually over night, let set fo an hour then load test each sepeately. You could have one or more dead cells. A cheap analog tester is just fine for this.
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Old 01-14-2013, 10:12 AM
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Before starting the truck or anything in the morning, open the hood and put your hand on the GPCM on the RH valve cover. See if it's hot/warm. Had a couple that were killing batteries overnight.

Aside from that, which is the easiest thing to check, what dannyboy said - charge and test the batteries, but I would get them load tested with a proper AVR machine for a real world answer. A lot of the lighter/cheap testers will pass a battery when in actuality it doesn't have enough jam to wind over a high compression diesel.
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Old 01-14-2013, 12:53 PM
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Bear in mind that fancy tester was invented/developed and tested useing analog equipment cause that was all there was to use at the time. LOL
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