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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