Hi all,
I have a 1988 Johnson 90hp. The VRO was removed before I bought it. The alarm horn doesnt work at all. I tried to test but no go so I am replacing the wire.
On the engine there is a tan wire coming from the overheat sensor on each (of 2) heads. The wires connect together and to a third "tail" at a point before the harness connector. The "tail" is not connected to anything.
By the way, the tan wires agree with the wiring diagram from my manual.
Q1) Did this wire go to the VRO? Can I cut it?
The tan wire then goes into the harness connector and on up to the helm where it connects to the horn (again, in agreement with the wiring diagram) There is also a purple wire connected to the horn and I cant figure out what that is.
Q2) Could the purple wire have been for the low oil level alarm on the old VRO?
Q3) When I replace the alarm horn, how do I check the temp sending units to be sure they send a signal to the alarm horn? Do I ground them at the head or connect a hot lead to them? (Seems elementary but I am still learning about how o/b wiring systems are different and I get a little confused)
Q4)Final questions. Are these temp sending units pretty reliable? If the test for the circuit works, can I assume the temp sensing mechanism works? What I mean is, do these things fail often due to NOT sensing an overheat and therefore NOT sounding the alarm?
Wow, that seems like a lot of questions. I really appreciate your thoughts on this one. By the way,. I do have a manual for the engine and doing the best I can following it!
I have a 1988 Johnson 90hp. The VRO was removed before I bought it. The alarm horn doesnt work at all. I tried to test but no go so I am replacing the wire.
On the engine there is a tan wire coming from the overheat sensor on each (of 2) heads. The wires connect together and to a third "tail" at a point before the harness connector. The "tail" is not connected to anything.
By the way, the tan wires agree with the wiring diagram from my manual.
Q1) Did this wire go to the VRO? Can I cut it?
The tan wire then goes into the harness connector and on up to the helm where it connects to the horn (again, in agreement with the wiring diagram) There is also a purple wire connected to the horn and I cant figure out what that is.
Q2) Could the purple wire have been for the low oil level alarm on the old VRO?
Q3) When I replace the alarm horn, how do I check the temp sending units to be sure they send a signal to the alarm horn? Do I ground them at the head or connect a hot lead to them? (Seems elementary but I am still learning about how o/b wiring systems are different and I get a little confused)
Q4)Final questions. Are these temp sending units pretty reliable? If the test for the circuit works, can I assume the temp sensing mechanism works? What I mean is, do these things fail often due to NOT sensing an overheat and therefore NOT sounding the alarm?
Wow, that seems like a lot of questions. I really appreciate your thoughts on this one. By the way,. I do have a manual for the engine and doing the best I can following it!