Electrical Question on a Unique

[patrija]

Hey everyone, got another question for the experts.

I'm working through a SEVERE battery drain with a local mechanic friend. He came by this evening for beers, talk, initial diagnosis, and more beers. We hope to wrap this up tomorrow. The battery will be completely dead overnight if left connected.

Here's what we found thus far using a test light in line only since he didn't bring his multimeter. Battery is in trunk with hot cable to a cutoff switch on the passenger footbox. Battery grounding looks good and the hot cutoff works correctly. The hot then goes to the solenoid, also on the passenger footbox. On the hot side of the solenoid, there are also two other heavy cables - one to the MSD box (also on the passenger footbox) and we think we've tracked the other to go back through the firewall where it joins a large bundle. This "other" one that looks like it goes through the firewall is definitely the drain - with it removed from the solenoid, the test light is dead.

We have not opened up the bundle on the other side of the firewall yet to see where it goes, but we did start pulling fuses in an attempt to kill the test light. No luck there. Any ideas????

Thanks
Jason