73 shouldn't have the white loop but the uni-directional white/black that
runs from the points-side of the coil to the bullet connector on the back of
the tach. Poor contacts in the white circuit as Skye says, plus the coil to
distributor white/black and inside the distributor (i.e. burned points) can
also cause it. It could also be internal to the tach, or in the green 12v
feed to it. If you can disconnect the white.black at the tach and it still
does it you know it is the tach or its green supply. If it stops doing it
when disconnected and starts doing it when reconnected it is a fair bet that
it is in the coil/points wiring.
PaulH.
----- Original Message -----
From: Skye Poier <skye@ffwd.com>
To: MG Nuts <mgs@autox.team.net>
Sent: Tuesday, February 22, 2000 11:15 PM
Subject: Re: 73 B Jumpin' Tach Needle
> Word on the street is that danray said:
> > Hi folks,
> > I just noticed today that my tach is behaving wildly. It jumps around
> > viciously but then seems to settle down to its normal self after a while
/
> > warm up.
>
> I'd check and clean the connections on both ends of the white "loop"
> wire and see if that helps..
>
> Skye
>
> --
> 1966 MGB - GHN3L Safety Fast! __,__\__
> The MGB Experience http://www.mgb.bc.ca/ (_o____o_)
>
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