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  1. C

    Tach for Merc outboard

    Twas the rectifier after all. Put the 4 magnet flywheel on, no change. New rectifier, tach works and looks like it's charging! Thanks for all the help. Cheers, Dave
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    Tach for Merc outboard

    Thanks Chris. I'm pretty sure this motor has been 'Frankensteined', so all bets are off. I'm sure the auxiliary stator and rectifier were added after. I wonder if when they modified it, they should have included the 4 magnet flywheel? More charging capacity? I might throw it on and try it...
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    Tach for Merc outboard

    Pulled the flywheel. Everything looks ok.... Is there a definitive test for a stator? Like resistance across the leads or something like that. I've included a couple pics. Two magnet flywheel is the one that was installed, and 4 magnet one is a spare
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    Tach for Merc outboard

    Looks like the stator is bad. I'll pull the flywheel today and inspect. Thanks again!
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    Tach for Merc outboard

    Yes, there is a grey wire, I will check to see which side of the rectifier it is attached to.
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    Tach for Merc outboard

    Good call. It's an 25ML model, so no charging system. It seems someone has made some changes though as there is a rectifier installed on it. Could a bad rectifier cause no tach signal? I have a new rectifier in my parts box and could try it.
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    Tach for Merc outboard

    Awesome info, thanks so much for the response. I will check that. If memory serves, I may have put a starter on this motor as there wasn't one.
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    Tach for Merc outboard

    I just wanted to clarify my earlier post. I bought a Mercury tach and the proper Mercury tach harness. After installation, I fired up my 2004 Merc Jet20 and the tach worked great. I took the jet motor off and put my 1996 25 Mariner on and now the tach doesn't work. Same harness on both motors...
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    Tach for Merc outboard

    Thanks for all the help! Working great with the Jet20. Put my Mariner 25 on and tach doesn't work. Also, seems like it's not charging as well. 12.5 volts running with brand new battery. Mariner is a '96, Jet is an '03. Hopin for something easy and obvious ;-) I'll start troubleshooting in a bit :-/
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    Tach for Merc outboard

    Wicked! Thanks alot. Cheers, Dave
  11. C

    Tach for Merc outboard

    Thanks for the reply, Chris. I will check Crowley and see if I can find the number. I bought a Merc tach, but had no wires with it. However the tach part # might lead to a wiring harness #. Not sure about the overheat buzzer. Under the motor cover, there is a loose brown with a connector that...
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    Tach for Merc outboard

    I am wanting to install a tachometer on my Merc 20 jet. I have Quicksilver controls with a single brown wire connector and a 4 wire connector coming off the back of the controls. Do any of these carry the signal for the tach? TIA Cheers, Dave
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    1996 Mariner 25ML timing

    Awesome, thanks for the info
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    1996 Mariner 25ML timing

    I have a 1996 Mariner 25ML outboard. The rod coming from the timing plate is fixed to a bolt on the block. It is adjustable for static timing only. My question is; is the advance electronic? TIA Cheers, Dave
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    remote controls for merc jet outboard

    I have a 2004 Mercury 20 Jet and a set of Mercury controls and was wondering if they can be made to work together including the forward-reverse function. Were they made from the factory to function together? Is there a special set of controls meant for a Jet outboard? TIA
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    25hp compared to 20hp

    Nice, good to know. I might do the same as the carb from my 25 has the set up for console control. Cheers, Dave
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    25hp compared to 20hp

    I am wondering what the differences might be between similar years of 20 and 25hp merc outboards. Other than, of course, the 5 horsepower ;-)
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    Lower crank seal 25 merc

    Same question about the crankcase seal under the flywheel. It is installed the opposite of the pic I sent.
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    Lower crank seal 25 merc

    Thank you sir. I will replace it as it has probably worn funny due to being not square in the bore
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    Lower crank seal 25 merc

    I pulled the power head off my 1997 merc 25 and found the lower crank seal cocked in the bore and what I believe is backwards as well. i haven't worked on outboards much, but every seal I've ever put in has the lip and the little spring on the inside. I'll include a pic and hope for some...
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