Posted: 11 May 2006, 17:38
I would run a new wire from the "live" side of the horn and attach it to the fuse box somewhere. It may be that you can just find the feed end of the existing wire and move that to a fuse.
The horn works... hurrah... unless the glo-plugs are charging
Im not sure what, if anything, I changed to get this semi-improvement but it does more or less confirm that its the voltage getting to the horn thats the problem.
And now it can pass its MOT... as long as I leave the ignition on long enough to get the glo-plugs charged... and the tester does the MOT in the right order
It being properly fixed would be better though.....