Firewall Relay ID Question

[Texasdeere]

1972 C10, 402, TH400, with A/C

I have a bad current draw on my truck. There is a relay on the inside firewall next to the steering column. It activates everytime I hook up the battery. It has three wires: Large Green, Large Red, and a Black wire. Does anyone know what this relay is for? The horn maybe?

There is another relay there too but it is not hooked up to anything.

Thanks

[Longhorn Man]

yep, horn. unplug it and see if the draw goes away. (it's real hot too isn't it?)

[Texasdeere]

Thanks! I put a new Grant steering wheel on recently. Think I will look there first.

Funny thing is the horn isn't going off!