OK, I just installed mine and am having the same problem with the same symptoms. I am 99% sure that in my case, both the accesory AND "constant" feeds are going off with the ignition. This is on a 2000 Jeep Wrangler. I plan to rewire with the main empeg lead going straight to the fuse box (rather than using the feed from the stock harness) tomorrow. Will post back with results.

-Mike