I have an 04 G35 Coupe. When I start my car the A/C is automatically on. My instrument panel light won't go on along with my stereo. I've replaced all the fuses, bought a new battery, check the wire harness & I can't seem to figure out the problem.
I need Help please.

 

I would check the instrument panel adjuster and take a good look behind the head unit/behind the ac buttons.
Im only guessing, but it sounds like something isnt grounded where it needs to be.

​​Have you done any mods or replaced anything recently?

 

I recently replaced my alternator, belts & purchased a new battery.
I was hoping by replacing those three parts my issues would go away!!
​​​​​​Parts replaced issue didn't get resolved.
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As mentioned above check the adjustment wheel for the panel lighting and make sure it's turned all the way on, it'll be to the left of your steering wheel in the dash. Super easy to check and a surprising number of new G owners don't even know it's there.