i have a 2000 grand am and i installed an after market radio and i need help i tried replacing the dimmer switch nohing happened, have the right wiring harness, and headlights turn n when i turn on the dimmer switch but the a/c panel doesnt even light up and my highbeam light illuminates but where it shows the rpms and the speed it doesnt illuminate i need help please! i also checked fuses and i checked fuses 15 a and 10 a because i dont have a manual and im not sure which fuse controls the illuminate lights on dash they dont even turn on at night when there supposed to, at night its supposed to sensor its dark and turn on but they dont so i dont know what to do help plese

On the back of the door for your fuse box there should be a diagram that shows what fuse is what and the amp'* either that or its printed on the fuse block its self

yea i know that but if i installed an after market radio and dash lights dont illuminate its a fuse for sure then??

sorry and what do u mean on the back of my door which door, i thought u meant on the back of the fuse box theres a digram that explains which fuse is which in short form i read it wrong n there is 3 fuses boxes in my car under hood passenger side n drivers side

Chances are if it happened right after that it'* a fuse. Fuses can look good but still be burnt out, so don't just visually inspect it and put it back in. You need to test it with a multimeter or swap it with a known good fuse.

There is a plastic door(well should be) thatyou pull off to see the fuses on the inside..if you can locate exactly what one is for the dash lights check it but it almost sounds like a short sense you said only the speedometer and Tach are out...it could just be coincidental that those two bulbs blew together

what happened was i took out the factorty radio snipped the wires in the middle to attach the wiring harness that fit onto my new after marker radio and they havent illuminated since so i think i either hooked the wires up wrong or the fuse is blown, adn i did test out every 15 a fused and swaped a few just incase and they all were fine adn in the process fixed my cigareete lighter n my car cause i foud that fuse blown so if you say its a fuse for sure ill check again and if it doesnt work what is the problem im gunna re wire everything also cause i know that if i have certain wires attachedd the dash wotn light up at all , just looking for some help .

well its speeodmeter lights, gas light, oil light, rpm lights all the lights that illuminate the gauges

I would double check the fuse for the guage cluster..Also feel free to make an Intro thread and post up pictures of your car we love pictures!

oh and its the lights on the a/c panel and lights on door dont illuminate eitehr, i have automatic locs and at night they light up and they dont and the a/c panel where u turn up the heat and turn the dieal cold or hot doesnt illuminate not just gauge llights sorry are they all hooked up together on one fuse?