Tom -
Yes it is a straight wire from the loop on the tach to the coil with no other
connections. The reason you can't get a signal at the metal clip on the tach is
the inductivly coupled signal to the metal clip is too small. The tach is a
current operated device. Resistance is very low and the voltage developed at
that metal clip is very low. The analyzer input is a high resistance device
which the low resistance of the tach effectively shorts out.
Ernest
----------
From: tom.wagner@Central.Sun.COM (Tom Wagner - Program Manager)
Sent: Wednesday, June 19, 1996 11:05 AM
To: barrister@lawref.com
Subject: RE: Tach Help
Ernst:
I know about all of this, but what I have a problem
with is not registering on the analyzer at the point
of that loop. The loop as a metal point that attaches
itself to the tach. I need to know is that a straight
wire that goes back to the coil, or does it go somewhere
else. I get no reading at the point that the loop
is, but do get a reading at the coil connection.
Any ideas????
Thanks
Tom
> From barrister@lawref.com Wed Jun 19 12:01 CDT 1996
> Date: Wed, 19 Jun 96 09:58:50 -0700
> From: Ernest Gilbert <barrister@lawref.com>
> Mime-Version: 1.0
> To: tom.wagner@Central (Tom Wagner - Program Manager)
> Subject: RE: Tach Help
> Content-Transfer-Encoding: 7bit
>
> Tom -
>
> The white wire from the coil goes directly to the tach, loops around a
>pickup, and then to the ignition switch. There is actually no connection at
>the tach, only an inductive loop. The tack measures the current in the coil
>primary through this inductive loop.
>
> The white/black wire goes to the points in the distributor and through the
>points to ground.
>
> Hope this helps
>
> Ernest
>
> ----------
> From: tom.wagner@Central.Sun.COM (Tom Wagner - Program Manager)
> Sent: Wednesday, June 19, 1996 9:45 AM
> To: mgs@autox.team.net
> Subject: Tach Help
>
>
>
> I have a 67 B, and I need some help
> on why my tach won't work. I know that
> the engine analyzer works at the coil
> okay, but when it is hooked up at the
> tach, there is no reading. SO......
> Can someone tell me the wiring from the
> coil to the tach??? How the wires go and
> what they go to. Some suggested that the
> tach might be bad, but when the analyzer is
> hooked up directly to the wire that goes into
> the tach, this doesn't work either. The schematic
> that I have is to good, as it is cryptic for
> this old man. I know that the wire is white or
> white w/black tracer.
>
> All help appreciated.
>
>
> Thanks
>
> Tom Wagner
>
> `67' MGB
> (Various stages of restoration - All
> Paint removed to metal, working on rust
> removal.) Waiting for day to become daily
> vehicle.
>
> `92' Honda Civic LX(Excellent car)
>
> `93' Honda Civic CDX(Moms car)
>
> Sun Microsystems
> Sun Service Division - Program Manager
> Phone: 713-964-7068
> Email: tom.w.wagner@Central.Sun.com
>
>
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