I have a 2002 Camry and my dsah lights are flickering and the head lights are dim

Try spraying the Dimmer Wheel with electrical contact cleaner. On my Lexus ES330 (Camry) it is to the left of the steering wheel. It is basically a variable resistance wire wound rheostat.

https://www.google.com/search?q=toyota+camry+dimming+instrument+panel+lights+on+its+own

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Was any of the brake light bulbs changed recently, the wrong type of bulb may be used causing a short in the socket, and making the rest of the brake and signal circuit malfunction. I no bulbs were recently replaced, start with checking for corrosion in each bulb socket, signal and brake bulb sockets. Let us know what you find

The problem probable is a short to ground on one of ur circuits. when u drive at night u have ur headlights on which forces the alternator to produce more electricity. making it seem normal. or a defective alternator

Fuses don't click. It's probably the relay kicking the compressor on. I would get it checked to see level of freon and how much voltage it's drawing. If thats all ok the compressor may be turning hard pulling more voltage which is dimming lights. If it keeps clicking it sounds like its low on freon.

Check all grounds everywhere

Check alternator output,both voltage & current

At some point you may just want to replace the head
lights or lamps which ever applies,AFTER you solve
the dimming thing

Is the battery really old

What you fail to think could even be considered
worth checking out,usually bites you

Stick to basics & don't assume anything TEST

The exact same thing happened to me... my lights don't flicker but my A/C is having the same exact issues.... if you find out what happened please let me know as well.

CHECK YOUR BATTERY CONECTIONS
AND HAVE THE BATTERY TESTED

turn headlights on and try moveing the wires by the head lights allthe way up battery and fuse boxes also check grounds by the lights if all looks good replace head light swicth.

Could be a loose or dirty battery connection, poor battery, or alternator. Check all the cables and connections to your starter. Clean your battery posts. Have your alternator and battery checked. It sounds like you are either running off just the battery or just the alternator. One of them is not right.

just replaced headlight switch and took care of problem