I have a '81 Pontiac Parisienne, 305 Hcode engine.
Recently the instrument lamp circuit (" ins lmp " on fusebox ) fuse
was blown; resulting in dashboard lights out and headlights left on
warning bell not sounding.
I replaced fuse ( tough to get to - in top left corner of fusebox ),
but it blew again ~3 hours later as I was driving.
Questions: What shoul I be looking for to remedy this? ( intermittent
short somewhere? ) The instrument panel is printed circuit I believe
so it's probably sound. I replaced heater core and spark plugs last
week -- the only recent work on car.
- Could I get away with a crude workaround to problem by replacing
the 5 amp. fuse with a 7.5 amp. fuse?
Or will this fry the circuit?
Please reply to NG.
I'd say that you have an intermittent short in the dash area. This
could be because of a wire that was moved when you replaced the heater
core, or just a normal time of life failure. The printed circuit
panel is not always foolproof, and that could be a normal time of life
failure as well.
What I would do is take apart the dash and check (and replace) the
wires etc. (and look for any bulbs that are going bad as well :)
Do NOT replace the fuse with a higher current fuse. This may cause a
fire, especially with a short circuit. It's prolly not worth your
life to save a few hours of poking in the dashboard.
Quid quid latine dictum sit altum videtur.
(That which is said in Latin sounds profound.)
The first thing I'd do is disconnect the headlamp warning
chime and see if the fuse blows again. (carry some spares)
The copper striping on the printed circuit will come loose
with age, especially where the connector plugs in, so that
would be the next thing to check. if the copper is peeling
loose, you can glue it back down with super glue.
All underhood, all unrelated to the dash lights.
The weakest link is the printed circuit and yes, it will
probably fry at 7.5 amps. I wouldn't over fuse it.
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