I have a black wire soldered to the steering column mast jacket inserted in the column. This black wire is connected to a brown wire that I have run directly to the Switch connection (right end) on the horn relay. I have nothing else installed to the column at this point. No spring, no contact plate, no wheel (removed), no cap. Just the column, bearings, and mast jacket.
I have two horns installed, Delco Remy Model 651 and they are wired together and connected to the Load connection (left end) on the horn relay.
As you directed, I removed the brown wire from the Switch connection (right end) on the horn relay. I ran the battery drain test. All looks good - 0.00 on the mm. Just to double check, I hooked the brown wire from the mast jacket again to the Switch connection (right end) of the horn relay. I reran the battery drain test and "horn #1" immediately started buzzing/moaning/blaring. So, I think the cause of the battery drain is "horn #1". "Horn #1" was extremely hot to the touch, so I assume it's the culprit. What I haven't done is totally disconnected "horn #1" and tried to hook up just "horn #2" to the Load connection (left end) on the horn relay to truly isolate the issue to "horn #1".
