1990 Johnson 120 new alarm horn still doesn't work

[FarmallM]

I replaced the alarm horn with a new one last night. It didn't sound when I turned the alarm on, so I traced the ground wire to the switch and the screw was loose, so I tightened it and then the alarm would sound briefly when the key was turned on. I made sure (twice) that the brown wire was connected to the terminal closest to the black wire, as per forum instructions. When I grounded the temp sensor on the motor (with the key in the "on" position) I still didn't get an alarm, so I tried the other temp sensor, still no alarm. Since the alarm sounds when the key is turned on, I assume the horn power & ground connections are ok. Should I check the continuity of the brown wire from the horn to the engine? Does the brown wire from the alarm horn go through the large cable that ends up at the large red rubber connector in the engine compartment? Which terminal in the plug is it? Thanks.
Marlin

 

[Joe Reeves]

Re: 1990 Johnson 120 new alarm horn still doesn't work

If the warning horn now beeps momentarily when you turn the key to the ON posiiton, then obviously the ground is okay and you have voltage applied to it. The Brown wire is considered to be TAN.

Adjust a ohm meter so that the meter pegs when the meter wires are connected to each other.

Disconnect the TAN wire from the horn. Rig a very long wire to the ohm meter so that you can have one meter wire connected to that disconnected TAN wire and the other connected to the TAN wire(s) at the engine... the meter should peg.

I have no idea what terminal within the electrical plug the TAN wire connects to BUT check the continuity at the TAN wire just before and after the electrical plug via a pin in the wire method. Should a break exist within the plug and cannot be repaired, simply use a jumper wire around/over the plug.

 

[FarmallM]

Re: 1990 Johnson 120 new alarm horn still doesn't work

Disconnect the TAN wire from the horn. Rig a very long wire to the ohm meter so that you can have one meter wire connected to that disconnected TAN wire and the other connected to the TAN wire(s) at the engine... the meter should peg.

Good idea, thanks. I hadn't thought of checking from the horn, through the plug, to the sensor.
Marlin