Last night's test -- heater on, dash lights out -- went as predicted. The tach
was spot on. This morning, just to make sure it was still there, I ran the
heater and the dash lights. By the time I got to work, the tach was in fact
abot 500 rpm high.
This morning when I left for work, it was 28 degrees out -- the maximum errors
were early in the week, when the outdoor temp was in the high fifties.
Anyway, it pretty much looks like the tach makes mistakes when it gets hot.
Which means either replace it or troubleshoot the electrics inside it. I found
the following: http://www.pixelmatic.com.au/cortina/tacho.gif
which is a schematic of, and a bit of advice on, a '60s Smiths tachometer.
Well, it's better than nothing. Looks reasonably simple...
Matt
matttrebelhorn@netscape.net (Matthew Trebelhorn) wrote:
>Last night, I drove home with the heater turned off. The tach was fine.
>
>This morning, I turned the heater back on. By the time I got to work, the
>tach was reading 500-1000 RPM high.
>
>The next test will be with the heater on, but no dash lights. I suspect the
>problem will not occur -- that it needs a combination of heat from both
>sources.
>
>Does that mean a bad transistor in the tach?
--
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