mothy
Junior Member
Am I correct in assuming that there is a fault if the horn operates if power is applied to the live wire, and ignoring the other wire the frame of the horn is grounded to earth?
I got to thinking about the horn sounding intermittently without pressing the horn button. But it would also not come on by exercising the steering.
I could not measure any unwanted grounding from the horn wire coming from the column, no matter what I tried.
So I got to thinking that maybe there was an internal problem on the horn. On investigation, the insulation around the screws that hold the brush holders in place looked somewhat deteriorated. I could measure from the feed wire into the horn a resistance to the frame of the horn.
I made up new stepped nylon washers (lucas points insulators). Reassembled and now the frame of the horn is insulated from the feed wires. Horn functions ok now.
The mystery to me is why it did not sound all the time anyway.
Roly
I got to thinking about the horn sounding intermittently without pressing the horn button. But it would also not come on by exercising the steering.
I could not measure any unwanted grounding from the horn wire coming from the column, no matter what I tried.
So I got to thinking that maybe there was an internal problem on the horn. On investigation, the insulation around the screws that hold the brush holders in place looked somewhat deteriorated. I could measure from the feed wire into the horn a resistance to the frame of the horn.
I made up new stepped nylon washers (lucas points insulators). Reassembled and now the frame of the horn is insulated from the feed wires. Horn functions ok now.
The mystery to me is why it did not sound all the time anyway.
Roly
