Intermittent horn electrical conundrum
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Another update...
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.....
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.....
One T25 in London, another one in Sydney.