GM Horn Not Working? Full Diagnosis & Fix (Relay + Horn) | 1972 C10

GM horn not working? No sound, no click, or no power at the horn? In this video I go through a full step-by-step diagnosis and repair using a 1972 Chevy C10. I test the circuits before and after, check the relay, wiring, grounds, and the horn itself — then fix the issue so you can follow along and solve it on your own truck or car. Most older GM vehicles use a very similar horn circuit, so this process applies to a wide range of trucks and cars. What’s covered: – Testing the horn – Checking power and ground – Diagnosing the horn relay – Verifying wiring and connections – Fixing the issue – Final test (working horn) Truck setup: 1972 Chevy C10 350 SBC / TH350 If this helped you out, drop a comment with what your issue was — always interesting to see what fails on these. More C10 content and how-to videos coming. #c10 #chevyc10 #gmc #classictrucks #autorepair #carrepair #automotive #automobile #mechanic