My reply to Greg raised the possibility of the car having been converted to
negative earth, and the tacho still being wired for positive.
Several people have now picked up the negative earth theme in their own
replies.
But Greg advises me that the car is still positive earth. I have
unwittingly led a false trail across his original question. Anyone want to
get back to his question? (Wish I could help further. The only tacho I
know anything about is a Mexican one you eat. Speaking of fine Mexican
restaurants, does anyone know Chretin's in Yuma?)
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
|