Sudden battery drain with hot horn relay

[myles66]

So I just registered to the forum not too long ago and have been lurking for quite a while. I have a question that may have been answered, but I haven't been able to find it in FAQ.
I have a 66 gmc c1000 I bought about a month ago and am using as my daily driver. 3 weeks ago I replaced starter and battery cables, truck was running fine. Started on a dime up until this week a few days ago... I've been on vacation and haven't started the truck in two days, I get in and to my surprise... No power at all. Jumped batt for about 15 min and it started up, but horn relay was very hot to touch, let it idle for about 20 minutes. I shut it off and started right back up. Went out a couple hours later, dead as a door nail. Took battery to get tested, only had 3 volts!!! So it's charged at store and battery is good. Can my horn relay be causing this? I'd rather not take alternator off and starter off to get tested if anybody has had problems with a horn relay before. I'm no electrician by any stretch of the imagination, so maybe the horn relay couldn't drain the battery at all. Any advice or experience with this situation could be very helpful... And hopefully it doesn't cost a arm and leg to fix!!!
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