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Mystery 10-12v Power Draw 2003 G35 Coupe

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Old Aug 16, 2025 | 08:21 AM
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Mystery 10-12v Power Draw 2003 G35 Coupe

Hi all, I'm having a tough time identifying where a 10-12v draw is coming from when the car is off. My investigation stemmed from the car completely turning off while driving then powering back on, and later that day leaving me stranded as there was no power no crank.

I started with replacing the battery fusable link and the car worked for several days until the same thing happened and I again had no power and no crank. I also noticed melted plastic on the black connector going into the battery fusable link. Also of note; both times there appeared to be no blown fuses on the battery link.

Breaking out the multimeter and checking the positive terminal i was getting a power draw between 10-12v when the car was off. I've subsequently checked/removed all the fuses, replaced the IPDM, disconnected the starter and alternator and a number of connections to various parts in the engine and around the car and still my multimeter reads 10-12 volts.

Not sure if my negative battery cable is bad but I don't think that would cause the power draw. What could I be missing? Thanks in advance.
 

Last edited by CustomESP; Aug 16, 2025 at 08:34 AM.
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Old Aug 16, 2025 | 10:41 AM
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One owner 2004 G35 Coupe 6MT
I would use the search feature here because I know this has come up numerous times. If memory serves correctly the audio amp in the trunk (Bose only?) has been a cause.
 
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