In a message dated 10/30/2006 11:42:31 AM Central Standard Time,
Ssandberg@MEDIATECH-INC.COM writes:
> I have a 1980 tr7 that is just emerging from a 6 year renovation
> project I have replaced the factory ignition with a crane xr700
> system with the a ballast resistor in line to the coil. prior to this
> the tach seemed to work (6 years is a long time though)
>
> the tach is now rarely works. every once in a while it works but most
> of the time it does not.
>
> I suspect a ground problem but I am unsure of where the instrument
> panel ground is
>
> alternatively I wonder if I should hook the tach wire up before the
> ballast resistor but that should not account for the intermittent
> operation
>
The typical hook up for a coil using a ballast resistor is to wire the
resistor between the coil and the +12 volt supply (white wire). The tach
should be
connected to the other side of the coil where the XR700 is connected.
Connecting it to the ballast resistor could work depending on the sensitivity
of the
tach. If the signal is right at threshold then operation could be
intermittent.
Dave
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