69 gto dash lights dim and gauges dont work

All dash lights can de dimmed , some have a switch on the dash and some are dimmed by turning the headlight switch .Make sure they are not turned off there. other then that check the fuses.

you have a short circuit in your headlight circuit

there is a regulator for the display brightness, you may have it turn'd down or it has stopped working;. it controls the brightness at which the dash lights are. usually has a speedo sign on it. goes up and down. it works with the main light and is conecter to them on the same lighting board if it has gone then a new light swtch control switch will be needed.

find the short, could be in the switch or a wire itself...and if you have a bulb out it complicates finding it even morenew fuse it, then turn things back on one at a time...should tell u where the problem is

You probably already checked this but the simplest solution is the control used to turn on the interior lights and to dim your dash lights. It is a dimmer switch to the right of your headlight switch. If it is turned all the way down then you would have no dash lights and no headlight chime. Turned all the way up it turns on your interior lights. If this isn't your issue and if no fuses are blown then try to turn the dimmer switch all the way up with your headlights on. If the dash lights come on with the interior lights then your switch is fried and you may have a short in the interior light circuit.

It is probably not a bulb if none of the dash lights are not working. There is more than one bulb. It is probably the the headlight switch or the roller switch that dims the lights.

Has a wireing problem ,best to see an auto electrical shop.

I can help you out with the left turn signal not blinking. Maybe it's a flasher or the light bulbs aren't getting current through the wiring.

I can't help you out with the interior gauge lights not turning on when you turn the headlamps on. It may have to do with the headlamp switch, though.

I've never seen the lights on the radio not dim when the headlamp switch is turned on. hm.

Good luck on this repair.

Check at the headlight sockets for a bad ground.