dspur

My horn does not work on 78 Pace Car. What is the first, and simplest things to diagnose? TIA

Mooser

1.. Fuse check (Stop/Hazard fuse I think)
2.. Unplug the horn(s) and stick a test light into the plug, ground to something good and press the horn button to determine if it's the horn or something else (I'd also use a set of jumper wires to test the horn its self with another battery...)
3.. Check for power coming out of the horn relay (green?) when you press the button
4.. If nothing is coming out the relay, check to make sure it's getting ground when you press the button (horn button grounds, power is there all the time)
5.. pull the horn button and use a piece of wire or screwdriver to short the horn ring to ground and see if that does anything.
5.. pull the harmonica connector and short the horn connection to ground to see if it's in the column or between the column and the horn
6.. gets complicated after that...
M

kanvasman

Sometimes these things die. They get water in them and pieces rust up. Then the little diaphram can't move. If you have power as required (and ground) then take it apart and check out the insides.

4-vettes

The most common thing to fail is the horns themselves. I've gone through 3 sets of them. This last time, about 10 years ago I got a pair of Holden horns that where made in Spain of all places. And they are still working!
And they look, and sound the part!

dspur

Thanks much. I'll follow your list and hopefully find the easy fix.

Alwyn678

I my have to get the Holden horn(Spanish made) of All else fails.