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Teleflex Tach on 1983 Merc 40

C

cloudix

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"I installed a teleflex tach a

"I installed a teleflex tach and hooked it up as directed. gray to send, black to ground, purple to ign. When i start the engine the tach works, but when i have the engine at WOT it goes beyond 7000 on the tach. Im sure the motor is not turning that fast. There is a selector switch on the back the is supposed to be 1/2 the number of alternator poles, 2, 3, 4, 5, 6. I have tried them all and still having this issue. Help"
 
Test your charging system. A d

Test your charging system. A defective diode in the bridge rectifier can cause those problems.
 
"Replaced the Rectifier and st

"Replaced the Rectifier and still have the issue, Double checked the wires for breaks and it looks good. Is there a way that i could test the charging stator? I put a ohm meter on the yellow and gray wires with it disconnected and it was mesureing out at 2 ohms.

Also how many amps does this charging system put out? 1982, merc 40 with the #2 charging system."
 
2 ohms is OK. Did you check t

2 ohms is OK. Did you check the yellow wire to ground? It should read infinity. I believe your stator is rated at 6 or 9 amps. (Perhaps someone else know for sure) If all that is good then the tach must be bad. Nothing else comes into play for a tach circuit.
 
The yellow to ground is testin

The yellow to ground is testing out good. The Tach is brand new out the box but I guess it could be bad. The strange thing is that it is smooth and steady until about 2000 rpm and it pegs the tach and stays there after that.
 
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