Up front - this is the caveman method, sort of.
The age old method that I discovered is a gentle rap on the thing while the
car is running. Mine sticks too, but this works for me, and may not for you,
so be careful. The BFH method isn't recommended for guages. I discovered it
only after I had tested the circuit and found it ok and in utter
frustration, I cursed and gave it a smack while sitting at a stoplight. Mind
you -- don't break the lens!
If the wire from the coil is sending juice (test at the coil wire per your
wiring diagram, then continuity at the other end that attaches to the tach)
to the tach (ground is a common with the other guages), it is likely that
the tach is jammed up inside. You might try gently tapping on the backside
of it from under the dash while watching for movement. It's worth a shot for
starters, and a much cheaper avenue than pulling it out and/or replacing it.
Please don't break it, or blame me if you do, but something about these
Smiths Tachs gets gummed up in humid weather. If it has been sitting that
way for a while the needle may be glued to "0", and the only fix then is
R&R.
Dan
73 B
-----Original Message-----
From: Bill Saidel <saidel@crab.rutgers.edu>
To: mgs@autox.team.net <mgs@autox.team.net>
Date: Sunday, September 27, 1998 8:21 PM
Subject: tach does not move
>OK you pros...I could use advice. The tach on my '76B acquired last May has
>not worked since I purchased it. My hands are somewhat large to delve into
>the mass of wiring behind the dash. What do you suggest as to the way to
>proceed? What should I look for, try, etc?
>
>>From my point of view, every suggestion will teach me something new.
>Thanks,
>Bill
>My second question is a bit longer term...over the winter...
>The car has a Zenith carburettor. What are the experienced thoughts about
>replacing it with a different setup? options? convenience? reliability?
>self-repair (me,not the carburettor)? What performance gain does a pair of
>SU's get over the single Z-S?
>
>Interesting for me, $$$ is not a big problem. Information is...
|