My family has a 2008 Mercury 50hp ELPTO 3cyl 2-stroke on our SunTracker 20 foot pontoon. The tachometer has stopped working. Since the engine appears to be running normal and producing positive voltage recorded via voltage gauge and battery is not loosing charge, I assumed the tachometer had gone bad and voltage regulator was still good.
I replaced the tachometer. However the tachometer is still not working. I then replaced the voltage regulator, 883072T six wire, and the new and old tachometer are still not working. I made sure I had continuity from grey wire (Sender wire)coming out of Voltage regulator ON MOTOR to grey wire on back of Tach gauge: Got continuity on wire from motor to gauge so grey wire is not broken between console and motor. I then checked “Ground wire” continuity on back of Tach to ground on fuse box, got continuity so have good ground. I then checked voltage on “IGN wire” on back of Tach to “Ground” on gauge with key on, got 12+ volts. As stated earlier, volt meter gauge ON DASH is showing 14 volts with engine revved and 12+ at idle. So it appears stator is producing AC volts and Rect/Reg is changing volts to DC …True? Just FYI, both tach's are set/calibrated to 6P on back of tach. I know I am missing something in my trouble shooting. I am hoping one of you guys can offer me some additional items to check. Not sure where to go from here. Thank you for the help.
I replaced the tachometer. However the tachometer is still not working. I then replaced the voltage regulator, 883072T six wire, and the new and old tachometer are still not working. I made sure I had continuity from grey wire (Sender wire)coming out of Voltage regulator ON MOTOR to grey wire on back of Tach gauge: Got continuity on wire from motor to gauge so grey wire is not broken between console and motor. I then checked “Ground wire” continuity on back of Tach to ground on fuse box, got continuity so have good ground. I then checked voltage on “IGN wire” on back of Tach to “Ground” on gauge with key on, got 12+ volts. As stated earlier, volt meter gauge ON DASH is showing 14 volts with engine revved and 12+ at idle. So it appears stator is producing AC volts and Rect/Reg is changing volts to DC …True? Just FYI, both tach's are set/calibrated to 6P on back of tach. I know I am missing something in my trouble shooting. I am hoping one of you guys can offer me some additional items to check. Not sure where to go from here. Thank you for the help.