midnight1957
Seaman Apprentice
- Joined
- Jul 21, 2009
- Messages
- 46
I have a 40 hp Mercury serial #OG252917 and I can't stop the oil sensor/high temp buzzer from sounding when I turn the switch on. Here is what I tried and found today.
The 2 blue wires from the oil sensor (when unplugged) from the motor has continueity, when I disconnect both of them the buzzer still sounds.
The tan wire from the high temp sensor (when unplugged) at the motor has continuety from the short wire to the black ground wire on the motor, when I disconnect the tan wire from the sensor the buzzer still sounds.
One time the buzzer didn't sound but as soon as I moved the wires going to the black box above the relays it sounded.
The wiring is as follows:
From the black box it has 5 wires coming from it.
The tan wire comes from the black box then splits and one wire goes to the sensor and the other goes to the buzzer.
The purple wire comes from the black box and goes to the buzzer.
The black wire coming from the black box goes to ground.
The 2 blue wires coming from the black box goes to the low oil sensor.
What is the black box and could it cause all of my problems and if I need one does anyone have a part number?
With the high temp sensor and the low oil sensor both showing continueity (when unplugged) does that mean that both of them are bad and need to be replaced?
I am at the end of my road trying to figure this out and would appreciate very much any and all help I could get. If I need to perform any different tests please tell me and I will.
Thanks for all of your help, I have learned a lot form this site.
Wade
The 2 blue wires from the oil sensor (when unplugged) from the motor has continueity, when I disconnect both of them the buzzer still sounds.
The tan wire from the high temp sensor (when unplugged) at the motor has continuety from the short wire to the black ground wire on the motor, when I disconnect the tan wire from the sensor the buzzer still sounds.
One time the buzzer didn't sound but as soon as I moved the wires going to the black box above the relays it sounded.
The wiring is as follows:
From the black box it has 5 wires coming from it.
The tan wire comes from the black box then splits and one wire goes to the sensor and the other goes to the buzzer.
The purple wire comes from the black box and goes to the buzzer.
The black wire coming from the black box goes to ground.
The 2 blue wires coming from the black box goes to the low oil sensor.
What is the black box and could it cause all of my problems and if I need one does anyone have a part number?
With the high temp sensor and the low oil sensor both showing continueity (when unplugged) does that mean that both of them are bad and need to be replaced?
I am at the end of my road trying to figure this out and would appreciate very much any and all help I could get. If I need to perform any different tests please tell me and I will.
Thanks for all of your help, I have learned a lot form this site.
Wade
