Topic: Tach problems on 2004 Mercury 3.0 200 HP

This topic has 7 replies, 3 voices, and was last updated 16 years, 9 months ago by BC Cougar.

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September 12, 2009 at 1:44 am #340302

weeman
Participant

I have been tinkering with my PIII as far as jackplate setup and trim and all of that sort of stuff trying to see what all I could get out of it. I have been taking it to a certain RPM and then adjusting trim and so on. Now my tach is starting to vary. It will sometimes read 2000 rpm at idle or jump to 6000 rpm when it was at 5000 just a second ago. I am not having any problems with the motor. Can anybody tell me how to check my stator and rectifier. I am an electrician by trade and I think they both are good but I sure would like to check it all with good instructions from someone who has done it on an outboard motor before. I am hoping it is just the tach. Thanks in advance, weeman

September 12, 2009 at 4:52 am #340316

Bass Cat Boats
Keymaster

What is the voltage when the engine is running. Usually that is a high reading or zero on a failure. Are the gauges analog or digital?

September 12, 2009 at 10:19 am #340337

Bass Cat Boats
Keymaster

The gauges are analog. I am getting a voltage reading of almost 12 volts at idle. I cant seem to ever catch the tach giving me a bad reading when I am trying to check voltage. If the stator or the rectifier was going bad wouldnt it effect the way the motor itself runs? weeman

September 12, 2009 at 2:01 pm #340355

Bass Cat Boats
Keymaster

Since they are analog gauges, we feel it is most likely a faulty gauge. At idle 12 volts is fine, though at speeds you should not be varying above 14.2 volts.

September 12, 2009 at 3:41 pm #340371

weeman
Participant

Can I order a new tach from Bass Cat??

September 12, 2009 at 3:44 pm #340393

Bass Cat Boats
Keymaster

While this post is still going has BCB or anybody else heard of anyone trying out a Fury prop on their Pantera III. I am running a 26 pitch Tempest plus now. I was just wondering if anyone had tried one and what pitch it might have been. Thanks, weeman

September 12, 2009 at 7:06 pm #340409

Bass Cat Boats
Keymaster

Those generally are a Mercury part for replacement, though see what BCB Parts has to say about it.

September 13, 2009 at 1:50 am #340424

BC Cougar
Participant

Not sure if your motor has 2 rectifiers on it like mine but if so plug your tach drive into the other rectifier. Mine went out a while ago and I thought the whole dang motor was on fire. I ended up needing a stator also after replacing the rectifier.
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