My horn will work with the ignition switch in the off position, but it will not sound if the switch is in the run position. I would like to check my horn relay (it's the original), but I can't locate it. I am not as limber as I once was, so I would appreciate it if someone could point me in the right direction. 1989 F150 5.0 2WD 5 spd.

Thanks. worm