Hi everyone, my 1999 Daimler Super V8 has started to go flat if left for longer than 12 hours. Put a meter on in and when I cut the engine it draws 500mA which settled down to a steady 330mA after a few minutes. Went through every fuse and found that if I removed the fuse for a body control module and the front driver seat it drops to 100mA. Is this now an acceptable draw or is it still more than you would expect to see? Should I replace the body control module @ 200mA draw to sort the problem?

 

The normal quiescent draw is about 25 to 35 mA which will leave a good battery OK for more than a month. Although I have never experienced the problem, and many folks do not seem to ever rind theirs, the most reported issues seem to be related to the horizontal switch in the ignition switch assembly, or an added accessory not shutting down The horizontal switch senses "key in the ignition" and it's status can be read with autoenginuity or the dealer level scanner. I would check it, first with some good "wiggles", then with a meter.

You can try a different BPM, but it is a fairly big deal to get it connectd to the rest of the car's modules, I think. With a low current DC clamp on ammeter, you could identify which BPM circuit was actually using the current, but those are not cheap. I suspect you will find that the BPM is holding on one or more of the power control relays- but why will still be a mystery.