So a wire fell out of your car while driving along? Highly unlikely, more
likely they didn't know what they were looking at. A 66 should have the
white wire from the ignition switch going through an inductive loop on the
back of the tach on its way to the coil. If this wire fails the engine will
stop, so if that is the type of tach you have (i.e. it hasn't been changed
for the later voltage pulse type which *does* have a white/black to the
coil -ve) it is more likely to be loose connections in the green and/or
black 12v and ground supplies to the tach, or internal problems, or possibly
the white has fallen out of the inductive loop.
----- Original Message -----
From: "Phillip Erikson" <perikson2@earthlink.net>
To: <mgs@autox.team.net>
Cc: "Phillip Erikson" <perikson2@earthlink.net>
Sent: Tuesday, August 13, 2002 10:15 PM
Subject: Tach Problems
> Hi, MG-Listers. After a recent dash R&R on my '66 B, I noticed the tach
making
> some wild gyrations and then finally quitting. When I took it to a good
> electric shop, they said there was no wire hooking it up, so they ran
another
> wire to the negative terminal of the coil. The tach worked again but it's
> reading about 500 rpm lower than it did before the R&R.
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