1990 GMC C1500 exterior lights

if dimmer switch is on flor unplug it andsee if lights come on if they do you need anew switch it can be the ground is bad so check battery to body ground and ground for lights.

Would that affect my raido or dash? Because they work fine and my right front lights work too.

no the ground is for the headlights/parking lights if they are out in back check theground back there as well on lh frame rail.

It's also my blinkers break lights literally all of my lights aren't working

do what I said in first reply then check to seeif your headlight switch is sending power to them for blinkers see if t/s switch is sending power through it. Otherwise have a pro look at it

Ok thank you.

So my tail lights, break lights, and rear blinkers aren't working and I was wondering why the problem could be.

have a pro do it I can't fix it for you.........you obviously haven't understood what I've replied. I have no further suggestions

Where is the ground wire located for the rear lights?

re read all the replies I've sent I 've already answered that

Thank your help sorry I'm 16 and I don't have very much auto experience as to wiring

like ai said have apro do it or someone who has experience with wiring circuits and what to do. Maybe if you have an auto shop class to take it to. You need a volt meter or test light to find problems and we can't walk you through it.