Where is the final stage resistor located?

[Multibeemer]

I know there are a bazillion posts about the dreaded battery drain problem, which my 03 4.4i has suddenly become afflicted with big time (new battery; goes from fully charged to stone dead in a matter of hours). Before I get too deep into the troubleshooting, could somebody please tell me where the final stage resistor is located? I've read that this is the culprit about 60% of the time. Also, is there any way to test it, other than making a visual observation? Thanks.