No Interior Lights at all Please help any advise

I have a 2003 Mustang GT Premium with automatic. headlights and tailights work fine. problem is the interior lights when you open any door do not work neither do the vanity mirror lights or the trunk lights. The car has the mach 1000 audio system and the head unit was dead. I removed it and put in and aftermarket unit but still no interor lights. All fuses have been checked and look fine. is there a ground somewhere i could be missing?

Thank you that will be a great help. I will have to do a search for GEM to see what it looks like and look inot this. Thanks

wmburns said:

The interior lights are controlled by the GEM. Guess where the GEM is grounded? Behind the center console at the same location the radio is. IMO, the center console is a great place to start looking.

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