Frank Acampora
Supreme Mariner
- Joined
- Jan 19, 2007
- Messages
- 12,004
There is not much you can simply do to test. With the ignition key on go back to the engine terminal board. Using a jumper wire jump the orange wire to ground and the buzzer should sound.. If you have a Mercury ignition the overheat wire may be a different color.
The sensor is in the head. It is a little more trouble but remove the circlip and pull out the sensor. Heat with a cigarette lighter until it is way to hot to touch (shouldn't take more than 15 seconds) then touch the sensor to a good ground. The buzzer should sound.
If the buzzer does not sound, remove it and test against the battery directly with a couple of wires attached to it. If it doesn't sound replace it.
The sensor is in the head. It is a little more trouble but remove the circlip and pull out the sensor. Heat with a cigarette lighter until it is way to hot to touch (shouldn't take more than 15 seconds) then touch the sensor to a good ground. The buzzer should sound.
If the buzzer does not sound, remove it and test against the battery directly with a couple of wires attached to it. If it doesn't sound replace it.