GXP Battery Drain

[MrGame]

My dads 2009.5 GXP has an issue where there is a constant battery draw. Even when it's hooked up to a trickle it still dies after a few weeks. It has an aftermarket stereo but everything I've checked says it isn't drawing anything when the car is off. Has anyone encountered this before?


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[TA427]

How did you test it ? You must use an ammeter in series between battery and cable, and let sit for at least 20 minutes for the modules to go to sleep