I am having electronic problems with my 1994 mazda 323 after i installed an aftermarket radio.
I just recently bought a 1994 mazda 323 as my all around car and project, when I installed an aftermarket radio i started having problems with the electronics such as the internal lights wont turn on and the rear lights don"t come on when i turn on my headlights, only when i hit the break. The drivers side headlight will not turn on although i could just need a new bulb and the inside light wont turn on and never has since i bought the car a month ago. When i bought the car everything was working fine, but when i went to change out the radio for an after market one i found that the radio wasn't even attached which didn't bother me at the time. When i start the car sometimes it makes this screeching sound like when you start the engine and then turn the key again, i turn the car off and then on again and its gone. I don't know if this is related to my problem but i thought it help in determining the problem.