Ground Loop
28.05.2021 22:35:36
3. If yes, can I simply t-tap the yellow/gray with the gray to the tach? here
See full version: Which wire runs the tacho from.the rectifier
3. If yes, can I simply t-tap the yellow/gray with the gray to the tach? here
OK Jeff, I took the yellow/gray wire and connected it to the gray wire of the harness, which goes to the tach. Tach signal works fine. so I'm guessing the digitizer in the rectifier is dead. [links]
At this point, I have both the yellow and yellow/gray connected to the rectifier, and have tapped the yellow/gray to the tach wire in the harness. The tach works, which is more than it has done recently. Next time out I'll see if it's all working. [links]
Haven't addressed the water temp issue yet. It's easy enough to deal with, just go to neutral and rev it up for 30 seconds. [links]
As for running the stator lead straight to the tach . not sure but you might get some very high voltage to the tach.
I'm not sure how hi a tach can take? [links]
However, why the manfacturer did not provide a tacho feed directly from the switch box using the coil trigger info . more
I'm having to rewire the boat so I'm unsure of where this wire would even go or what it is accomplishing. It seems unnessecary and my thought is to leave it out. My only thought is it grounds out the stator and acts as a kill switch but from my reading if you allow continuity between the black yellow wire and the black wire, that will kill the engine. Those two wires run to the M terminals on the switch which are connected when the switch is in the off position. If that Gray wire is a backup kill switch then I wouldnt even know which terminal to attach it to on the ignition switch (assuming it terminated there).
The voltage is measured from that lead to battery ground and the tacho works out the engine speed based on the fixed drive ratio or trigger pulses and the number of poles in the alternator.
Can anyone explain why the Gray wire off the rectifier runs up to the ignition switch? This is for a 1984 Mercury 50 outboard motor. 4 cylinder 2 stroke. No power trim.
I only have a rectifier, no reg/rec on this motor. [links]
Remove the rectifier wires from the terminal block. Using a ohm meter, connect the black lead of the ohm meter to the rectifier base (ground), then one by one, connect the red lead of the ohm meter to the yellow, yellow/gray, then the red wire (some rectifiers may also have a fourth yellow/blue wire. If so connect to that also). Now, reverse the ohm meter leads and check those same wires again. You should get a reading in one direction, and none at all in the other direction.
So it seems that my stator is bad since tach is not registering a signal? more
I only have a rectifier, no reg/rec on this motor. more
Re: Rectifier or Stator sends signal to Tachometer [links]
I performed a preinstall to test the set up; plugged wire harness into new tach and cranked engine before fully installing into console. The tach registered power (needle moved from resting to '0') but did not register the signal from engine.
Overnight i charged the battery as it was running as a total loss system (although it still had 12.4v). here
Ski idles at 2200 rpm out of water, and starts almost first click of the starter every time.. even in water its an easy start.'
Compression is 150psi in both cylinders.
now i know i need a rectifier, but since im in australia, i want to make sure that i dont have another problem (the cutting out at high rpm) so i can get parts from USA in one hit.
Now for the problem:
On Saturday i took the ski out and it still was running poorly over 4000rpm, sputtering etc. From the forum guru's i understand that this is a rectifier problem.
I pulled up on the beach and disconnected the red wire from the rectifier.
The ski ran great for a good 3 hours and i had no problems at all for the remainder of the saturday. here
First i'll give a bit of background:
I have recently replaced all fuel lines, cleaned fuel filters, rebuilt carbs (38PSI pop off now roughly in both), replaced oil in rear cone, trimmed spark leads, replaced spark plugs, and replaced starter. more