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  2001 Mercury 90: Replacement Rectifier Lacks TACH Signal Lead

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Author Topic:   2001 Mercury 90: Replacement Rectifier Lacks TACH Signal Lead
MikaelK posted 08-26-2014 03:58 AM ET (US)   Profile for MikaelK   Send Email to MikaelK  
Hello. I have a 2001 Mercury 90-HP FOURSTROKE outboard, SN OT300888. I replaced the regulator-rectifier with a new and updated part (804278T12), and it works well. But this new component is missing the gray tachometer signal wire that my old unit had and that connected to the boat's tachometer. The tachometer in my boat is manufactured by Teleflex. The tachometer has three wires: 12-Volts, Ground, and SENSOR. I know that there exists a Quicksilver Tachometer module, but I have no idea how to connect that to my motor with existing engine harness in place.

Can one find the tachometer signal in any other wire on this engine? Or, can I splice one of the three AC stator wires and connect that to my gray tachometer wire? Thank you in advance--Mikael

jimh posted 08-26-2014 07:30 AM ET (US)     Profile for jimh  Send Email to jimh     
Perhaps you have purchased the wrong part. In the c.2001 epoch, Mercury was changing over to their Smartcraft instrumentation, and perhaps the part you have purchased is intended for engines with Smartcraft, where the tachometer signal is generated by another method.

A good Mercury dealer might be able to help out with this problem. Or the CDI aftermarket electronic parts supplier's website might have some information. Their replacement part for your engine has the GRAY lead:

http:/ / www. cdielectronics. com/ product/ rectifiers-regulators/ mercu ry-mariner-voltage-regulator-194-5279-replaces-815279-817411-830179-8545 14-854515-856748-65w-81960-00-00-65w-81960-10-00-8152791-8152792-8152793 -8152794-8152795-815279a1-815279a2-815279a3-815279a/

jimh posted 08-26-2014 07:32 AM ET (US)     Profile for jimh  Send Email to jimh     
Also see

MikaelK posted 08-27-2014 02:49 AM ET (US)     Profile for MikaelK  Send Email to MikaelK     
Thanks for your feedback!

I'm quite certain that this part is the correct one, the updated version of the r/r for both Yamaha and Mercury is this component that's missing the grey tach lead.

My plan is to splice one of the green wires coming from the stator and hook that ac-signal to the grey lead going to the tachometer.

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