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When you turn on the A/C the engine RPMs drop slightly. If this causes the dash light to dim slightly then I would suspect your alternator is weak or the drive belt is slipping. Check the belt and adjust or replace as necessary. Also check the output of the alternator with the engine running at idle. You should get a reading of 13.5 to 15.5 volts on a digital volt meter.
What else can I help you with?
Why are the headlights working but no turn signals no instrument panel and no brake lights?
Check the fuses and the bulbs.
What is wrong with a 2002 Ford Explorer when you turn the key and the engine will not turn over but the dash instrument panel goes haywire with lights flashing and making a chattering noise?
These could all be symptoms of a very low battery.
Why won't instrument panel lights and tail lights turn on in 2001 aurora. The fuses appear to be good?
Possible bad headlight switch. The switch is actually 2 switches in one. One side turns on the headlights and the other contacts turn on the tail lights which also feed the instrument panel through usually a 5 amp fuse.
How do you repair instrument panel lights that doesn't turn on on a 1995 GMC Suburban?
To fix the 1995 Suburban instrument lights, check the light fuse first. Check the light switch. If these are ok, then check the instrument cluster for proper power and ground connections.
How do you change the dash lights in a 1991 Nissan Sentra GXE?
I assume you referring to the instrument panel lights,,, first remove the dash ,,,and the remove the screws for the panel,,, then flipping the panel over you find the plug sockets for the small bulbs,,,some twist quarter turn >
Why are the instrument panel and tail lights not coming on when you turn on the headlights in your 2000 Corvette C5?
Check parking light fuse - should be the same circuit
Where is the rear turn signal bulb located on 2001 camaro ss?
At the front and rear turn signal lights. The turn signal flasher relay is located, RIGHT of steering column, mounted to bottom of instrument panel carrier. The Hazard flasher relay is located LEFT of steering column, mounted to bottom of instrument panel carrier
Why would all the instrument panel lights come on when you turn on the ignition but go off when you turn on the park or headlights and the radio come on when you turn on the park lights?
I had a similar problem with a Pontiac some years back. It was a bad dashboard ground. It may not be it, but I would start there.
Why does the turn signal and brake lights work on your 2003 Liberty's towing package but not the running lights?
There are several fuses relating to the lighting. The fuse panel is at the left end of the instrument panel (drivers side). Open the divers door and look about armrest high to locate the fuse panel cover.
2005 buick la crose how do you dim instrument panel lights?
The is a small button in the center of the headlight switch that pops out when you depress it. Simply turn the small button to raise or lower the dash lights.
Is the relay for turn signal in the fuse box on a 2001 oldsmobilealero?
No, the turn signal flasher relay is locatedbehind the center of the instrument panel.
Why does the instrument panel go out when you turn the headlights on?
fack knows
