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Yeah I always turn the switch to off. My dad showed me this trick of putting a bulb between the negative terminal of the battery and the truck to see if there was a load when everything was off. The only thing that lit the bulb up was when I had the eess hooked up so it was the thing shorting...

It seems that the S3 eess in my truck is shorting out somehow. I came out the other day and the batteries in my truck were completely dead. I have the ground kit installed and the batteries are less than a year old. Even with the run switch in the off position, the eess is pulling a draw...