Battery Drain

[BozDMAX]

My batteries drained flat a couple times in the last week so I cobbled together an ammeter and found a 10A+ draw which I finally narrowed down to the MBEC 1 fuse in the underhood fuse block. MBEC apparently stands for Mid Bussed Electrical Center and runs, among other things the power seats.

So, I spent an hour on ALLDATA trying to find the thing by searching and following diagrams and am getting nowhere.

Can anyone tell me where that thing is so I can keep tracking from there?

Thanks

John

[NutNbutGMC]

My batteries drained flat a couple times in the last week so I cobbled together an ammeter and found a 10A+ draw which I finally narrowed down to the MBEC 1 fuse in the underhood fuse block. MBEC apparently stands for Mid Bussed Electrical Center and runs, among other things the power seats.

So, I spent an hour on ALLDATA trying to find the thing by searching and following diagrams and am getting nowhere.

Can anyone tell me where that thing is so I can keep tracking from there?

Thanks

JohnI want to think that should be diagrammed in your service manual. I was looking for fuses the other week and saw a lot of just about everything in the service manual. I found my trailer light fuses in three different places.

[More Power]

My 2001 electrical diagrams book wasn't much help. It didn't have an MBEC fuse that I could find.

Do you have heated seats? The seat heat controller is powered via a "Hot All Times" circuit, but is controlled via an ignition switched logic circuit. If the logic circuit failed, it could cause the problem you're seeing.

Jim

[BozDMAX]

The OWNER'S manual (that comes in the glove box) only mentions the MBEC fuse and that it powers the seats and right doors.

I do not have a SERVICE manual, but do have a subscription to ALLDATADIY.com that is pretty good for some things, but leaves a lot to be desired for others.

Since pulling the fuse, the seats no longer adjust or heat and the right side windows are kaput. I have not had time to get back out there and work on it again just yet. I was hoping to find a location for the MB electrical center so I could do some triangulating from one location. Barring that, I will unplug seats and windows one at a time and keep at it that way.

Seems like there ought to be a diagram to locate the relays for the power seats, as that is one of the easier things to pull and swap to check for the draw.

Other ideas?

John

[More Power]

A 10-amp draw is quite a lot.... If it's the seat heater, you should be able to feel the heat. Otherwise, unplug the heater connector (beneath the seat) - then check the draw. Then like you mentioned, work your way through the other possibilities....

Jim