battery dead - permanent electrical leak - Hemi Truck Club
 
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Old 07-01-2014, 12:24 PM   #1
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battery dead - permanent electrical leak

Hi,

I recently bought a 2007 Hemi Pickup truck.
Has been used as a workhorse before...and will be in the future ;O).

I got used to the fact that now and then ABS and Engine light go on and off, and I gave up investing further money with my Dodge dealership to find these bugs.

I use the hemi for recreational purpose and don't care too much. If errors are disappearing by themselves...shouldn't be too serious I guess. When ABS light is on, brakes still work, w/o ABS, but OK - who had ABS when we have been young (at least in my days there weren't even brake boosters...)

However...
There seems to be an electrical problem as the battery is dead if I leave the truck sitting there for a few days.

Lights, Radio etc. definitely switched off.

To narrow down possible root causes i tried the following.

I switched off ignition, pulled key, left truck, closed door.

Then disconnected the positive battery pole and put an amp meter in between.
I can see a permanent draw (leak?) of 1.4amps.

So i started pulling fuse by fuse to figure out which circuit it might be.
I put th efuse back if current did not change.

Result is that fuses #51 (Ignition FCM) as well as Fuse #10 (Ignition Run/ACC) carry about 50% of the current, each.
taking both out reduces current to zero.

Not sure if this procedure is a valid one, but it was the only one I had in mind w/o access to further diagnostics tools.

I do aprecciate any hint, as I will be back in country end of september, where I want to finally eliminate the problem.

Any help very much aprecciated

Thanks folks

Karl

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Old 07-01-2014, 01:02 PM   #2
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Hi Yukontruck,

Yes that is valid and your results are indicating a problem. You seem to have a high resistance short. This may be a damaged component or it may be a wire/connector issue. In either case you need to check the resistance of each loop then star unplugging things from the loop until your resistance increases tremendously. 12/.6 amps=20 ohms that is nearly a full short circuit E over I*R is Ohms law and your voltage is aprox. 12v so dividing by the current, in this case about 0.6 amps you have 20 ohms resistance in each of those loops. With the switch off you should have nearly infinite resistance as the circuits should be open except for maintenance draw, which should never be more than maybe 20-30 milliamps.
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Old 07-01-2014, 01:20 PM   #3
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Hi preachp,
thanks for the hint.
Is there a source available where I can get schematics of my hemi, so I can figure out what devices / consumers are connected to the circuits?
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Old 07-01-2014, 01:56 PM   #4
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Sound alike from te fuses your pulling either the fuse panel has a short (pretty common) or the asd relay is sticking open the fuse panel and pull the big relays one at a time and see if draw goes away
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Old 07-01-2014, 02:08 PM   #5
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Txs, I will check the relays then.
If the short in the fuse panel is pretty common, do you know about cost of a new one and complexity to repace it?
Still hope it is the relay, but worst case I want to be prepared, as this truck sits a bit out in the bush and ordering parts spontaneusly doesn't work (next dealer is 160 miles away).
So if cost are affordable and replacing does not require to visit a dealership. I might simply buy the parts and replace all suspicious.
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Old 07-01-2014, 04:39 PM   #6
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The fuse box itself won't but I believe on the 2007 the tipm is built into it so in that case it will require a visit sorry check relays first thou and see if that's the issue
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