You didn't say what type of instruments you have. If you have the
cluster that is part of the shifter console, it pretty common for it
to have a short or a pinched wire. Check the wiring plug in the
console to make sure its plugged in properly and its clean. You would
be surprised at how many times over 30 years a coke or coffee has been
spilled on it. Of course, check the ground for the console and make
sure the right type of bulb is being used. If you don't have a wiring
schematic I would suggest unplugging the console from the rest of the
car and see if everything works ok when the lights are on. If the
lights are ok and the problem occurs when you plug in the console
gauges, at least you have a starting point.
If you only have the regular standard cluster then I would pull the
speedo fuel cluster section out and check to make sure the mylar on
the back has not been cut or pinched. There is only one big plug in
the back. ( if memory serves me)and the speedo nut. You should also
drop the steering column, it will be easier to pull that section out.
Now to isolate the problem I would first check all the lights in the
lighting circuit. Which are the parking lights, tail lights, side
markers,ect. The front parking lights are known to rot out and cause
all kinds of problems. Especially, make sure to use the right bulbs.
Turn on all the lights and see how they all look. If the turn signal
indicator lights are on in the inside, how do they look on the
outside? Are they on too? Or off? If they are off then I would look
for a problem inside the car. If they are on, diconnect the bulb in
the grille and see if the indicator lights inside change at all. If
its off you have to look at the fire wall plug,turn signal relay, and
follow the harness all the way to the front turn signals( pay
particular attention to the connector, over time it can actually move
inside the plug and reverse the polarity). I can't cover every
scenario but I hope this gets you started. I would strongly suggest
you get a service book and go to this web site. http://www.camaros.org
Its a great source for the first generations. If you have any other
questions just email me.
Ed 68SS 355 powered.......
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