Wiring Dia. 1997 Force 75HP

[vickersfan]

Does anybody have a wiring diagram for my 97’ Force 75HP? Looking for the Tachometer circuit. Tach on dash jumps around and doesn’t seem accurate. Does this seem like a motor tach part problem or dash or wiring?

 

[Redbarron%%]

I could be wrong on this, but I believe that there is a tap off the rectifier/regulator (gray wire if I remember correctly) that feeds pulses from the charging coil to the tach.
This (if the same as a 1995 Sport Jet) has 20 pulses per rev. I cannot say for sure what your 1997 75 hp is.
That being said the problem is most likely a wiring problem or loose connection in the tach if the engine is charging the battery.

 

[legalfee]

Redbarron you are correct. The rectifier only has four wires: two yellow from the trigger, red to +12, and gray to the tach. I put a cheap rectifier on my 95 and my tach was real flakey. Replaced it with a CDI and it's rock solid.

 

[vickersfan]

Thanks fellas!

 

[Redbarron%%]

By the way you can connect one pole from the coil directly to the tach and that signal will work as well.
It works from the pulse frequency and not voltage.

 

[roscoe]

All good but....

That motor has a 12 pole stator, so can use the common 12 pole tach.

 

[jerryjerry05]

Anything that new is Mercury Ignition.