TurboJoe
New member
- 68
- 2
- 0
- Location
- Lafayette, NJ
Ok, I just stumbled on this thread looking for something else and couldn't help but read through it.
I think you are making it complex, and skipping testing the diode at the same time. This is a very simple system, here is what I would do.
1. Verify 24V a the horn from wire 26, you did that and looks all good.
2. Disconnect wire 25A and leave it disconnected until you get the horn working.
3. Measure the resistance from the wire that cam off of 25 to ground with the horn switch open and everything connected. The meter should read O.L. for out of limits. Any number displayed on your meter in ohms mode will signify a problem. If you see a number, any number then there is a short circuit somewhere on wire 25 or the horn switch. If you find this to be the case (which I am assuming will be) then start disconnecting every spot of wire 25 that you can easily. Measure from each end, you should again get an O.L or open reading from you meter. Any ohm reading at all on that wire side signifies your problem lies there. Look at what could be causing the short on that section of wire, and fix.
4. Put everything back together when you fix the short, and put the meter again on the wire that came off 25 and to ground. The meter should read O.L since you fixed the short. Now hit the horn switch, it should read a number, 5,10, 25, ect. Unless the number is high everything should work. If that number is above 100 ohms, I would look at the contacts in the horn switch.
5. Once everything works, install a new diode to 25A in the proper direction.
There isn't any voodoo of black boxes, just the correct methodical testing will solve the problem.
I think you are making it complex, and skipping testing the diode at the same time. This is a very simple system, here is what I would do.
1. Verify 24V a the horn from wire 26, you did that and looks all good.
2. Disconnect wire 25A and leave it disconnected until you get the horn working.
3. Measure the resistance from the wire that cam off of 25 to ground with the horn switch open and everything connected. The meter should read O.L. for out of limits. Any number displayed on your meter in ohms mode will signify a problem. If you see a number, any number then there is a short circuit somewhere on wire 25 or the horn switch. If you find this to be the case (which I am assuming will be) then start disconnecting every spot of wire 25 that you can easily. Measure from each end, you should again get an O.L or open reading from you meter. Any ohm reading at all on that wire side signifies your problem lies there. Look at what could be causing the short on that section of wire, and fix.
4. Put everything back together when you fix the short, and put the meter again on the wire that came off 25 and to ground. The meter should read O.L since you fixed the short. Now hit the horn switch, it should read a number, 5,10, 25, ect. Unless the number is high everything should work. If that number is above 100 ohms, I would look at the contacts in the horn switch.
5. Once everything works, install a new diode to 25A in the proper direction.
There isn't any voodoo of black boxes, just the correct methodical testing will solve the problem.
