My truck is drawing 1.58A with the key off and door closed. It kills the batteries in just a couple of days. (or hours if it hasn't been fully charged)

When I pull the battery 50A fuse under the hood, it drops to essentially 0A.
When I pull the I.O.C fuse under the dash, it will drop to .08A
When I disconnect the harness under the driver's seat, it drops to 1.18A.
When I disconnect the box at the right knee, it drops to 1.48A.
When I disconnect the power lock fuse in the dash, it drops to 1.42A.


So does anyone have any thoughts on what my problem might be? I don't even know what the I.O.C circuit is. What's on that circuit?

 

I'm not sure whats on that circuit but that sounds like where most of your amp draw is coming from. What fuse number is that? Maybe we can figure out exactly what is on it.

 

About a year ago if my truck sat overnight my battery was dead, I had battery and altenator tested and they were fine. I did the same thing by pulling fuses and the battery would be fine so Ic took it to a mechanic who took it to another mechanic and several hours and hundreds of dollars later they found that it was a seatbelt relay inside the drivers seat that was causing the battery to drain. I disconnected the seat and everything is fine now.

 

Not sure if he's coming back or not but so that if anyone else looks at this post to find a similar situation to their truck he ended up tracing it down to a faulty seat belt control module. After he added everything up he relized he was taking into account the current from the underhood light and the halo light around the iginition. After he figured those into the equation he was looking for something smaller then a light that is when he remebered that he had relocated the module. After dissconnecting it it fixed his problem.

Now story times over.

 

I had the same issue with a drain and it was ID'd as the Seat Belt Control Module. Replacing it is about $165 plus labor. What is the loss if I just disconnect it? Is this just to run the seatbelt dummy light on the dash if I don't buckle up? Where is it located and how hard is it to disconnect?

Update: I found some more information online and it looks like it needs to be replaced for several reasons, mostly safety. I guess I know what I'm doing this weekend...

Thanks in advance for any help.

Greg