I installed a new steering wheel and am troubleshooting the horn. it didn't work before the install so I am sure it's not that. where is the horn relay on a 72'?
Are you guys sure? The horn relay on my 72 was under the dash pad, about center of the dash. The relay on the firewall is for the blower motor.
You are correct. I just got home and went to check. Mine is a '68. I was looking at the A/C relay. So, I looked up the manual for the '72. It shows it up and behind the glove box, where Ryan found it. https://www.teambuick.com/reference/years/72/72_wiring_diagram.html
nice easy fix! he prior owner had it unplugged along with the buzzer. Probably because the steering wheel that was on there was shot (center horn button all mangled. Works great now