hi,
I have a 1984 242 glt turbo with a rather strange problem
regarding the tach and instrument cluster lamps. I was replacing the
clock and accidiently shorted one of the power leads ( either the
one for the clock or its lamp I'm not sure). So I replaced fuse
that had blown. But now I measure no voltage at either the lamp
or clock power terminals. In addition all instrument lights
except for the turbo guages don't come on. I tested the bulb
in the clock and it is still good. So I'm wondering if I maybe
I shorted something in the circuit board of the cluster?

I used a voltmenter on the three terminals in back of the tachometer
which provide power to the clock and it's lamp. All read no voltage(except for
the ground which is still fine). In addition
what is even weirder is that when I turn on the head lamp switch
while driving, the tach drops to 0 unlass I turn the dimmer to
the lowest. Regardless the dash remains dark but the tach won't work
unless the dimmer is at it's lowest.

I don't think the dimmer is broken because the turbo guages still
light up an dim. According to the manual they have a seperate connection
to the dimmer, while the clock and the instrument cluster are all on the same
connection. Anyway I hope this makes sense. And any help would be greatly
appreciated. I think I just need a new cluster or circuit board as
everything else seems to check out. But I'd appreciate any suggestions in this
matter.

Thanks,
Drew