1986 90HP MERCURY INLINE 6 TACH PROBLEM

[PROFESSIO]

I HAVE A 1986 MERCURY 90 HP INLINE 6 CYL. THE TACHOMETER DOES NOT WORK AND HAS BEEN REPLACED NEW. NEW TACH NOT SHOWING ANY READING EITHER. DOES ANYONE KNOW EXACTLY HOW TO CHECK THE SIGNAL FROM THE MOTOR TO THE CONTROLS AND THEN TO THE TACHOMETER? WHAT SENDS THE SIGNAL TO THE TACH? IS IT THE VOLTAGE REGULATOR? IF SO HOW TO TEST IT. THIS IS DRIVING ME NUTS AND I CAN'T FIND INFO ANYWHERE!!! THANK YOU...ROB

 

[Barnacle_Bill]

Re: 1986 90HP MERCURY INLINE 6 TACH PROBLEM

Check your rectifier. The tach lead is the gray wire coming off it. When they go bad the tach usually quits working too.

 

[PROFESSIO]

Re: 1986 90HP MERCURY INLINE 6 TACH PROBLEM

THANK YOU, I WILL CHECK THAT ASAP AND REPLY. I WAS TOLD THAT I MAY NEED TO UPGRADE TO A MORE EFFICIENT REGULATOR/RECTIFIER COMBO PART BECAUSE THE STATOR MAY BE PUTTING OUT TOO MUCH FOR THE REGULATOR TO HANDLE. EVER HEAR OF SUCH THING??<br /><br />THANK YOU,<br />ROB

 

[PROFESSIO]

Re: 1986 90HP MERCURY INLINE 6 TACH PROBLEM

problem solved!!! i bought the $3.00 rectifier from radioshack suggested by phatmanmike and everything works fine now. Bill, thanks for pointing me to the rectifier in the first place. i was going crazy trying to find info!!<br /><br />rob