No RPM Reading on Tach

[Scooch_2]

Not sure if this is best here or the electronics forum. I have a new to me 2002 70 TLRB Yamaha. On the digital Yamaha tachometer the RPM is always at 0. I given the wiring a quick once over but did not spot anything obvious. The oil level, hour indicator, and trim indicators all work. Any suggestions on where to start checking?<br /><br />Scooch

 

[rodbolt]

Re: No RPM Reading on Tach

check the green tach send wire from the tach back to the rectifier.

 

[Scooch_2]

Re: No RPM Reading on Tach

Got a chance to go out and look at the wiring today. It appears the wire goes all the way back, but I did not test it for continuity. Will try that next.

 

[rickdb1boat]

Re: No RPM Reading on Tach

Check the charging system too, as this is where it gets it's signal. No charge, no Tach...

 

[Scooch_2]

Re: No RPM Reading on Tach

The charging system seems to be OK, the battery has charged up from the low 12's when running. I'll probably not go too far until my manual arrived. The motor (and boat) need a bit of care to get them back to where they should be.