Tachometer Wiring

[scottscar54]

First, let me say thanks to the folks who helped me recently with my magneto issue. Very much appreciated. Now, on to new issue. Same 1963 Merc 650 (Serial 1621723) on a boat I saved from a backyard of a friends house. It was in pretty poor shape initially. Have the outboard running wonderfully thanks to you folks who helped. The question is though, how do I hook up the Tachometer that is in the dash? Some idiot had cut the wires at some point in the boats history(there are 3) from the Tachometer. I do not know where they go. Based upon my electronics background, I would guess that one is a power lead, one is a ground lead, but what about the third? Does anyone have a wiring diagram for this? What color wires to where? I am guessing that one wire goes to the rectifier but which one? I recenlty purchased an old Kiekhaefer control box to try to bring the controls/motor back to original but there is no Tach connector on this model control box. Any help is greatly appreciated. Feel free to email me directly at scottscar54@cox.net THANKS A MILLION!!

 

[Trent]

Re: Tachometer Wiring

First off... From your serial number its a 1964 model. Is this a "direct reversing" model?<br /><br />650 (65,0) 1606282 - 1765043 1964 4 cyl

 

[scottscar54]

Re: Tachometer Wiring

According to the housing, it is a "full gear shift". At http://www.oldmercs.com, the serial is listed as a 1963 but the parts are basically the same between the 63 and 64 so not to worried about the year. Also found the original parts listed for the motor at http://www.mercruiserparts.com listed as a 1963. Thanks though.