mercury tachometer wiring harness

• 2023-07-03

The mercury Tachometer has four wiring harnesses: red wire, which is connected to the power line of the Tachometer. There is an hour meter on the Tachometer, which needs to work continuously. Therefore, the red wire must be kept powered at all times and can be connected behind the power fuse. The black line is the ground wire of the mercury Tachometer. The yellow line is the working line of the Tachometer, and the light on the panel is on. Connect the yellow line to the ignition power line, turn on the key pedal Tachometer and start working. Blue line, the signal line of the Tachometer, and connected to the trigger signal terminal of the igniter. 

If the common fault of the mercury engine Tachometer is that it does not work. The reason is that there is a problem with the wiring harness or the instrument itself is malfunctioning. Check the mercury engine Tachometer according to the following steps: (1) Check whether the "No. 1" terminal of the ignition coil is in good contact. (2) Check whether the black three hole socket behind the Tachometer is in good contact. (3) Check the operation of the three hole socket with a multimeter. If socket A is poorly grounded, check if the brown wire in the white 14 hole socket of the instrument harness connector is grounded; If there is no voltage in socket B when the ignition switch is turned to "on", check if the black wire in the black 14 hole socket of the instrument harness connector has power voltage; When the ignition switch is turned to "on", if there is no voltage at socket C, check whether the red/black wire in the white 14 hole socket of the mercury instrument wiring harness connector has good contact with terminal "1" of the ignition coil. If the black three hole socket harness behind the Tachometer is normal after inspection, the fault lies in the mercury Tachometer itself, and the Tachometer should be replaced.

If the mercury boat Tachometer suddenly returns to zero while driving, the engine oil light is on, and the boat marine yacht has no power, there may be a problem. If the mercury still has power, it may be a problem with the wiring harness. However, if the mercury loses all power, it is not only a problem with the wiring harness, but also a possibility of an ECU problem.