electrical leak related to radio

[pony]

I am a new owner of a high-miles 2004 Astro Van. I have isolated a 2 A leak to two circuits (it will drain the battery over night). Removing the "Radio-Batt" fuse drops the leak to 0.6 A, and also taking out the "Radio-Assy" fuse drops the leak to 0 A.

Some questions:
What exactly do those circuits run?
Are there online wiring diagrams for these vans?
Suggested next steps to get rid of this problem? Just replace radio? Or is the problem more likely in the harness or plugs?

thanks to anyone who may know and share!

[AstroWill]

Disconnect the radio connector and see if you have the same issue. Aftermarket or OEM? Usually issues like this affect aftermarket radios much more often than OEM radios.

If you want to look up the wiring diagrams, I highly recommend the GM Techline eSI that can be had on the web, many seem to like the Virtualbox image that is floating around. See the links in my signature/profile.