relay for odd use

Ok, well, this probably isn't too odd, but I've never actually used a relay before, even though i know generally how they work and why they are used.  I have a car that has a fused circuit that has a short in it.  when the fuse is in, there is 1+ amp current drain with the car totally off...it happens to be the fuse that works the horn and my convertible top and some other interior lights...i've tried to isolate where the short is on that circuit, but have not had any luck.  Anyhow, I really don't want to pay some mechanic $80 an hour to trace this thing, i generally just take the fuse out and only put it in when my top needs to go down.  I'm giving the car to my brother and don't really want him to have to deal with this issue, so I had and Idea that i could possibly use a relay to keep the circuit with the short on it closed from the battery when the car is off by having it connect that circuit when the ignition is turned on.  If any of you could tell me what type i would need and what i need to connect the poles to, I would appreciate it...and so would my brother i'm sure.

I would not suggest doing it this way, but being that you want to, I will help.  You'll just need a regular automotive relay, some spare wire, female quick-connects, preferably a soldering iron and tape, and a ring terminal.  Figure out the wire that controls the bastard circuit, be sure its the right one, and cut it in half.  Take one side, put a femal quick connect on it and slide it onto the relay terminal labeled 87, do the same with the other side except put it on terminal 30.  Now take a piece of wire, put another femal quick connect on one end and slide it onto the 85 post of the relay, put a ring terminal on the other end of the wire and ground it.  Now take another piece of wire, again put a female quick connect on it and slide it onto the 86 post of the relay.  Strip the other end and connect it to a wire at the ignition harness that shows 12 volts only when the car is in the run position, it should not show twelve volts when the car is cranked.  That'll do ya

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thanks for the help...if anyone has any other suggestions on bypassing this...i'm open to it, but it was the best i came up with