All,
I have a parasitic drain on my truck that I have narrowed down to the BCM1 fuse in the Drivers side fuse box which feeds to Light Blue plug on the BCM (there are 3 power feeds on the light blue plug).
I have about a 300 ma draw that drops to near zero (40 ma) when I pull the blue plug or the 10A BCM1 fuse.

I have purchased all the drawings for the truck and they are very helpful. But what they don't tell you is which circuits on the light blue plug on the BCM does this BCM1 power source feed.
As I dig through the drawings, I see that there are some things that don't work when the fuse is pulled such as hazard lights, cargo lights, cruise control, etc, but there is no drawing that tells me exactly what BCM1 feeds. The BCM is like a black box, no schematics for it.

Does anyone have a way to tell what circuits the Red/White BCM1 fuse feeds?

Thanks a bunch

 

I can't tell you where your drain is, but my under hood light on my 1998 Chevy K-1550 was powering the light when I wasn't driving.