115 Evinrude Tach Dropping Out?

[Traxion]

Have an issue with my 1995 Evinrude 115 tach. When I start the motor, the tach shows properly. It also works when revving the engine with the idle enhancement lever. But when I click it in gear and throttle up, it works for a moment then dies out. I have read a few threads and understand this could be the regulator. Any other ideas? I recently replaced my CDI, could the regulator have affected my CDI going bad? I don't believe I am getting a charge, definately not the 13V+ I should be getting. All help is appreciated! Thanks!

 

[Seasport]

Re: 115 Evinrude Tach Dropping Out?

Sounds like a faulty rectifier/regulator - especially since you're not getting charging voltage.

You haven't disconnected the battery with the motor running have you? This can fry a rectifier/regulator. Did replacing the powerpack fix your original problem? Common element to p/p & Rr/r is the stator.

 

[Traxion]

Re: 115 Evinrude Tach Dropping Out?

Yes, the PP did fix the problem. I had a cylinder dropping out. The tach has not worked for probably 4 or 5 years (I bought the boat from a friend of mine a year ago). I don't believe that the motor has been disconnected while running, but I can only say I have not, don't know for sure about previous owner. I looked at the r/r's on the engine parts page, there must be 2 or three manufacturers? This motor also must be classified under V-4 crossflow w/35A? Is there any harm being done running the boat w/ the bad rectifier? What relation does the stator have to these issues? I've dealt with stator issues before on sleds, but it was problems within the stator causing the problem, nothin else. Thanks for the input!

 

[Seasport]

Re: 115 Evinrude Tach Dropping Out?

I think if you have had this problem for 4 or 5 years, the rectifier is probably OK. Your battery would go flat otherwise. Just what voltage are you getting when the revs are up?

May be a faulty tach. Check the ground connection on the tach. Is it a Teleflex tach? Your symptom has been reported as a problem with some motors with no regulator. The solution is to put a 2000 ohm resistor between the send and ground terminals. I guess the voltage levels get too high for the tach at higher revs.

You can also disconnect the gray sender wire from the rectifier and connect it instead to the yellow or yellow/gray wire coming directly from the stator to the rectiifer. The tach should happily run with this signal as well.

The stator windings are what powers the battery charging circuit and the ignition system. Different windings for each.

 

[Traxion]

Re: 115 Evinrude Tach Dropping Out?

The boat really hasn't been used much until I bought it. I remember the tach working when they first got it. I get 9-10V when running. Not the 13-14V I should be getting. I really don't ever run into my starting battery getting low, I always charge it before I go so I probably wouldn't notice if it were not charging. I read an FAQ on testing water cooled rectifiers, that might be what I do. Zees, those rectifiers are expensive!! Gotta do what you gotta do though. I'd really like to get the tach working so I can do some prop work. Thanks for the help!

 

[Seasport]

Re: 115 Evinrude Tach Dropping Out?

Oh, that does sound like your rectifier is faulty. Perhaps you had some electrical mishap which took out both the powerpack and the rectifier.

I don't think the meter test will work on the combined rectifier/regulator. That's for the straight rectifier.