Tachometer still not working

[ttikalsky]

I finished troubleshooting the tachometer, I hope. Maybe someone here
can confirm my findings.

Turning on the ignition, motor not running, causes the tach needle to
spin 1 complete revolution ending up pointing straight down. When the
motor is started the tach needle will occasionally appear to work but
not with any consistency. Ussually points straight south. I replaced
the drive unit on the motor with no change. Tonight I began removing
wires 1 at a time and testing for any change. Eventually I ended up
removing the guage and connecting a jumper wire to the power and 1 to
the ground. At this point the needle aligns to zero. When I add a
single wire to the "S" terminal the needle spins all the way around
and points south. This happens even when the wire attached to the "S"
terminal is new wire still on the spool. I'm thinking the guage is
junk. Can anyone confirm this?


Troy, Waconia MN
1983 FC33

[Gregory OConnor]

Troy, I have the same problem but it is on my speedo. with the key on
or with the gen running the tac reads 1k and the speedo reads 15mph
and even clocks the miles. I was told I have 'electrical noise' and
the wire that runs the speedo is picking up a stray current. Maybe
you have a wire leaning up against the tac wire that is
bleeding 'electrical noise. Dont know, sounds SiFi but I plan on
giving it a look at before I go to a Speedo shop
Greg O'Connor
94pt40
Romoland California

--- In WanderlodgeForum@yahoogroups.com, "ttikalsky"
wrote:
> I finished troubleshooting the tachometer, I hope. Maybe someone
here
> can confirm my findings.
>
> Turning on the ignition, motor not running, causes the tach needle
to
> spin 1 complete revolution ending up pointing straight down. When
the
> motor is started the tach needle will occasionally appear to work
but
> not with any consistency. Ussually points straight south. I
replaced
> the drive unit on the motor with no change. Tonight I began
removing
> wires 1 at a time and testing for any change. Eventually I ended up
> removing the guage and connecting a jumper wire to the power and 1
to
> the ground. At this point the needle aligns to zero. When I add a
> single wire to the "S" terminal the needle spins all the way around
> and points south. This happens even when the wire attached to
the "S"
> terminal is new wire still on the spool. I'm thinking the guage is
> junk. Can anyone confirm this?
>
>
> Troy, Waconia MN
> 1983 FC33