Horn wiring

i found the plug with the violet and green wire under the dash for the relay, but cannot find the ground wire that's connected to the horn button at the wheel to supply the ground. I jumped the ground on the relay to a good ground and the horns worked. Need to find that black ground from the button..... found it on the plug, but that goes to the fuse block.


??What plug? The horn relay connector or the column connectors? The horn button wire only goes one place---from the horn button, out onto the column connector, and from there to the horn relay