"Hello,grumpy
I have a automatic 1985 Corvette Coupe; when I turn the A/C on, my oil pressure drops to '7' or '8', and my fuel display goes down about a quarter of a tank. When I turn the A/C off, everything returns to normal. (This is all on the dash)
I don't have much experience working with cars, so I'm sorry if I'm using the wrong words. (Gotta start somewhere!)
Does anyone here have any ideas on where to start, or what I should start checking, or know why this happens?
Thanks!!! "
that could easily be a symptom of a loose electrical ground , bad battery connection or low battery, defective alternator, loose serpentine belt, under drive crank pulleys can all effect this, Id suggest cleaning the battery terminals and checking grounds, gauge readings depend on current flow, if the current draw rate increases past the alternators ability to supply current your lights dim, gauges read funny etc.
these links should help
viewtopic.php?f=50&t=3110&p=21360&hilit=multi+meter#p21360
viewtopic.php?f=36&t=3222&p=8575&hilit=test+alternator#p8575
viewtopic.php?f=50&t=609&p=5672&hilit=test+alternator#p5672
viewtopic.php?f=48&t=4729&p=12842&hilit=battery+connection#p12842
viewtopic.php?f=70&t=3901&p=10343&hilit=battery+terminal#p10343
viewtopic.php?f=44&t=3401&p=8972&hilit=battery+terminal#p8972
viewtopic.php?f=36&t=8493&p=29779#p29779
http://garage.grumpysperformance.com/index.php?threads/chasing-a-crazy-electrical-glitch.986/
viewtopic.php?f=36&t=317&p=13210&hilit=battery+connection#p13210
viewtopic.php?f=80&t=728&p=9217&hilit=battery+connection#p9217
viewtopic.php?f=70&t=3504&p=9219&hilit=battery+connection#p9219
viewtopic.php?f=32&t=1401&p=5445&hilit=test+alternator#p5445
I have a automatic 1985 Corvette Coupe; when I turn the A/C on, my oil pressure drops to '7' or '8', and my fuel display goes down about a quarter of a tank. When I turn the A/C off, everything returns to normal. (This is all on the dash)
I don't have much experience working with cars, so I'm sorry if I'm using the wrong words. (Gotta start somewhere!)
Does anyone here have any ideas on where to start, or what I should start checking, or know why this happens?
Thanks!!! "
that could easily be a symptom of a loose electrical ground , bad battery connection or low battery, defective alternator, loose serpentine belt, under drive crank pulleys can all effect this, Id suggest cleaning the battery terminals and checking grounds, gauge readings depend on current flow, if the current draw rate increases past the alternators ability to supply current your lights dim, gauges read funny etc.
these links should help
viewtopic.php?f=50&t=3110&p=21360&hilit=multi+meter#p21360
viewtopic.php?f=36&t=3222&p=8575&hilit=test+alternator#p8575
viewtopic.php?f=50&t=609&p=5672&hilit=test+alternator#p5672
viewtopic.php?f=48&t=4729&p=12842&hilit=battery+connection#p12842
viewtopic.php?f=70&t=3901&p=10343&hilit=battery+terminal#p10343
viewtopic.php?f=44&t=3401&p=8972&hilit=battery+terminal#p8972
viewtopic.php?f=36&t=8493&p=29779#p29779
http://garage.grumpysperformance.com/index.php?threads/chasing-a-crazy-electrical-glitch.986/
viewtopic.php?f=36&t=317&p=13210&hilit=battery+connection#p13210
viewtopic.php?f=80&t=728&p=9217&hilit=battery+connection#p9217
viewtopic.php?f=70&t=3504&p=9219&hilit=battery+connection#p9219
viewtopic.php?f=32&t=1401&p=5445&hilit=test+alternator#p5445
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