Final bits of the rebuild, added twin horns, thought that I should test them before adding the OEM relay arrangement.
Horns don't work, barely a click/fart/whimper.
Took horns off and tested direct off the van battery. They work.
Took steering wheel off and shorted the horn ring contact back to the battery earth with a jumper lead. Little more than a squeak.
Continuity tested the whole steering column including a full dismantle and separation off all the clamps right down to the relay box. All good inc. the collapsible element bridge wire and relay box to earth.
All spline joints scrubbed, greased, reassembled.
No difference.
Tried a different ignition switch. Same.
Pulled all the stalk connectors on and off a few times, checked for contact corrosion, nothing obvious.
By which point I was knackered! Why would I not have 12v on line 15 to feed the horn ring contact? Thats the first thing to check this arvo.
All the earths were changed to two ring terminals and M6 rivnut fixings, so its not the earth crowns at fault for once.
I have a lovely clean relay board at work that looks like new, next step is to swap that over incase something has happened during the protracted restoration work years ago i.e. water ingress and corrosion.
