So I just had these three components quit at the same time, not certain if they are related? I searched and looked up the electrical circuit but couldn't find anything on the trunk switch.

Basically, when the key is inserted into the ignition, the dinger sounds, but when it is turned to "ON", the dinger stops (It usually changes to a slow ding but quit doing that).
Also, dash lights will not come on with parking lights or headlights. Courtesy lights are fine. I found that it could possibly be the transistor after looking at the dimmer section in the Fiero cave?
And the third thing, the trunk release button will not open the trunk, except it occasionally does every now and then!

Are these three things related? All the fuses are fine. I can't find any relays that might go bad. Still somewhat new with the fiero so not totally certain what's happening!

Have you cleaned the grounds and added a new ground wire from the negative battery cable to the chassis this could be a intermittent ground problem.

Cleaned the negative battery ground, good contact, but no change. Is there another ground connection somewhere? Fuses are still good.

Do you have a fully charged strong battery? Which engine do you have the 4 or the 6. You might try unplugging the chimer too it may be shorting internally.

Battery is brand new and strong! It's a V6. The lights worked up until the other day. They flickered a few times before going out completely.

Here is a diagram of the dash lights. Power for the lights comes from the headlight switch on the brown wire. It splits @s211 and goes to the dimmer and pin "D" of the dimmer transistor. Power comes out of the transistor on pin "C" and goes through the 5 amp "inst lps" fuse and then on to the lights. The dimming signal comes in to the transistor on pin "B".

If you have power to the transistor on pins "B" and "D" with the headlights on, and the 5 amp fuse is good, your transistor is bad.

Fixed! It was a bad transistor. Replaced with a new one and all is working again.

Thanks for the diagram! I didn't see this one in the Haynes manual, I probably should obtain the real factory one…?