[chip61]

I hate electrical issues. At first I thought son's 06 had a bad battery. I charged batteries and left cables disconnected for a week and it started right up. Connected, the batteries will drain if it sets more than a day. I disconnected cables and hooked up test light to ground and neg post and light is lit so definitely a draw somewhere. I disconnected hid's and amp and pulled every single fuse but there is still a draw somewhere. Any ideas?? I'm hoping tipm isn't culprit but I'm out of ideas. Nothing obvious like glove box light or under-hood light stuck on.

 

[DieselTech77]

First of all, were all of the connections tight? And secondly, check the positive cable that goes in between the 2 batt's. If its got a spot somewhere where it is burnt up or corroded, that's your trouble maker. I assume you already checked terminal cleanliness and tightness though, right? Also, does it have a tuner with gauge monitor or a gauge that shows IAT? The grid heater could be sticking on and to tell quickly, you could see what the IAT is.

 

[easymon]

I had a drain prob when my truck was new there was a tsb to update tipm modual and also do not leave key in just off posision put it to lock when in 1st off possision it do not shut power off to moduals . For if you have a manual tran and leave in reverse and key in 1off possision the reverse lighs will stay on.