OK, then you should have 12v on the green, ground on the black (a wiring tag
secured under one of the knurled nuts that clamp the tach onto the dash) and
the white/black should be switching between 12v and ground when the engine
is running. Note that an analogue meter will display this last as about 6v
and a digital meter may not display a settled reading at all. If you have
an after-market electronic ignition system you may get different readings on
the white/black, and this can be the cause of the tach not working anyway.
If you have these readings on the back of the tach the wiring is OK and the
tach itself is suspect. By the way, seeing as how the car has not run for a
couple of years it could be stuck. Have you tried giving the tach a rap
with your knuckle while the engine is running? If the needle bounces off
the end stop but still does not register then the problem is possibly
electrical inside the tach and not mechanical. If it stays on the end stop
it could be well stuck.
PaulH.
----- Original Message -----
From: Enrique Claure <spanlab@ceibo.entelnet.bo>
To: <paul.hunt1@virgin.net>; <mgs@autox.team.net>
Sent: Tuesday, August 08, 2000 11:06 PM
Subject: Re: Tach is dead
> Paul, its a 77B type tack. Enrique
> SPAN Inc HeadQuarter
> PO BOX 6524
> La Paz Bolivia
> South America
>
>
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