Chris Kotting wrote:
It's been awhile since I've done one but I think I remember going inside
and
having to snip a resistor lead and resolder on another terminal but
can't give more details.
I'm sure someone else can confirm whether you need to go inside the tach
itself.
I also remember it being printed in an earlier Moss Motors cataogue
years ago as a
techtip!
Regards
Alan
> Daryl's right.
>
> As I recall the change is simply to mount the loop the other way
> around.
> (I.E. Looking at the back of the tach, put a masking tape flag on the
> part
> of the wire that leaves the loop to the right. Turn the loop around
> so
> that the tape flag is on the left.)
>
> Chris Kotting
> ckotting@iwaynet.net
>
> On Wednesday, February 11, 1998 11:17 PM, Daryl May
> [SMTP:mayfam@sprynet.com] wrote:
> > Greg,
> >
> > Is the car still positive earth, or has it been converted to
> negative? I
> > am positive that a positive earth tacho will only work on a negative
>
> earth
> > car with some wiring changes, which include changing the white wire
> loop
> in
> > some way. Sorry if this sounds negative, but it may explain some of
> the
> > difficulties (and PO's wiring changes), and perhaps this will need
> to be
> > considered in the solution?
> >
> > Daryl
> >
> >
> > ----------
> > > From: Greg MAHNEY <mahney@central.murdoch.edu.au>
> > > To: spridgets@autox.team.net
> > > Subject: Troubles with Tacho
> > > Date: Tuesday, February 10, 1998 6:45 PM
> > >
> > > I'm still trying to get the Tacho (it's an electronic one) on my
> Mk 2
> > > Sprite to work. It never has worked in the months that I have had
> the
> > car.
> > >
> > >
> > > Looking under the dash there is a spade connector on the back of
> the
> > Tacho,
> > > and a green wire nearby. I've pushed the green wire onto the
> connector
> > > (this seems to tie in with the wiring diagram I've got). Apart
> from
> the
> > > instrument light there did not appear to be any other connections
> until
> I
> > > started untangling the mass of wires under there.
> > >
> > > I then found a white wire which has a loop in it which is totally
> > enclosed
> > > in a block of opaque nylon. Is this the other wire? Does it
> connect
> to
> > > the other side of the Tacho to the green wire? Is it a case of
> putting
> > it
> > > on that thin threaded post and finding a small nut to secure it?
> If
> so,
> > > there is no obvious electrical contact, does the thing just sense
> the
> > > electrons whipping past (sorry - I'm a sociologist, not an
> engineer:-)
> > ) ?
> > >
> > > As you might expect, I did try connecting it but nothing happened.
>
> When
> > I
> > > checked that there is a white wire at the coil, there was (on the
> > oppisite
> > > terminal to the one which leads to the distributor) but there was
> an
> > > additional (blue) wire connected next to the white wire. It has
> > obviously
> > > been added by a previous owner and goes from the coil to thin air
> near
> > the
> > > Tacho. That is to say, it looks to me like someone tried to
> replace
> the
> > > white wire with this blue one. In the interests of
> experimentation I
> > held
> > > that (blue) wire to the thin threaded terminal, but nothing
> happened..
> > >
> > > So far I haven't been able to get the Tach out of the wooden dash
> (see
> my
> > > other post today) so I am keen to test the tacho in situ. Can
> anyone
> > tell
> > > me how to do this please? And/or answer the questions above?
> > >
> > > I appreciate the help.
> > >
> > > Greg
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