Parasitic Power Drain - Jeep Patriot


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Old 07-01-19, 07:15 AM
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Parasitic Power Drain - Jeep Patriot

Hey all,

I have a 2010 Jeep Patriot and my battery has been drained a couple of times in recent weeks.

The alternator checks out but I discovered a parasitic power drain.

I unhooked the negative battery cable, installed my multimeter and began removing fuses. Once all fuses were removed, battery was still getting drained by 180 milliamps.

I then disconnected the alternator with the hope that a shorted diode was allowing power to drain, but I still have the same drain.

Not sure where to go from here... Any suggestions?
 
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Old 07-01-19, 09:53 AM
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You used the multimeter between ground and the negative post and checked the battery by itself and it's good?
 
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Old 07-01-19, 03:46 PM
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Battery is good.
I get the power draw when I disconnect the alternator and when I remove all the fuses from the totally integrated power module (TIPM).

When I disconnect power cables from underneath the power module, I am able to isolate the power draw to 2 different harnesses. I don't understand why removing the fuses didn't let me isolate the issue though.

I'm guessing the next move is to go pin by pin on each of the harnesses?
 
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Old 07-01-19, 04:36 PM
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How many fuse boxes do you have? Did you disconnect ALL of the fuses?
 
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Old 07-01-19, 06:27 PM
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One fuse box. I disconnected everything.

The draw only disappeared when i began disconnecting cables from the fuse box
 
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Old 07-01-19, 06:54 PM
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Removing the fuses does nothing, then and disconnecting cables does. Which line eliminates the draw, the upstream or down stream from the box? I would assume the upstream?
 
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Old 07-01-19, 07:20 PM
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Did you also unplug the regulator plug on the alternator.
On some vehicles it gets always live unfused power.
 
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Old 07-01-19, 08:08 PM
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The alternator was completely disconnected, both the main cable to the battery and the smaller clip-in switch.
 
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Old 07-01-19, 08:12 PM
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I'm not sure what is meant by "upstream" and "downstream"

I disconnected the harness connectors under the TIPM. The parasitic draw was reduced by about half when I disconnected connector "A" and the rest disappeared when I disconnected harness "B".

I'm guessing I have to go pin by pin to discover which circuit is problematic, but I'm left wondering why removing the fuses didn't affect the drain (secondary concern) and also wondering what harnesses A & B bring power to.

Lastly, one of the Pins in plug "A" shows minimal corrosion while all the other pins are in great shape. I"m guessing pin 13.
 
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Old 07-02-19, 08:57 AM
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I hope you find the problem, Steve, but that can be a tough one. There's just too much stuff and wiring diagrams can be pretty complicated to trace a problem through.

I take it there's no CEL s or codes to help you? Sometimes just cleaning up the grounds and connections can fix a lot. It's more of a shotgun approach and you're left with "fixed it so who cares what it was."
 
 

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