wiring diagram

i really need a wiring diagram for a 90 chevy half ton radio. i have a haynes book and it says nothing about the gray wire i need. the orange,black,yellow,brown,and gray r all in a group. i either need a schematic or at least someone who knows wut the gray wire is for? it comes out the other side of the adapter thing as orange n its spose to be the illumination/dimmer wire but i have nowhere to put it? i had it all on once and the radio worked fine but then i took it out and triedto put in a new one but idk wut happened there so i put it back in and now the radio wont work? anyone able to help?

i really need a wiring diagram for a 90 chevy half ton radio. i have a haynes book and it says nothing about the gray wire i need. the orange,black,yellow,brown,and gray r all in a group. i either need a schematic or at least someone who knows wut the gray wire is for? it comes out the other side of the adapter thing as orange n its spose to be the illumination/dimmer wire but i have nowhere to put it? i had it all on once and the radio worked fine but then i took it out and triedto put in a new one but idk wut happened there so i put it back in and now the radio wont work? anyone able to help?

I recently installed a radio/cd player in my 90 GMC K1500. The wiring should be the same as a Chevy. I won't be home for a while but I can post later tonight what the gray wire is for.

I probably wont be able to post until 10 PM PST tonight.

//2000CAYukon

ok well whenever u post ill see

The factory service manual shows:
Black = Ground
Brown = Park Lamp
Gray = Dimmer
Yellow = Ignition
Orange = Memory (always on)

The Gray wire also goes to AC Controller, I/P Cluster and Convenience Center. It also goes to the Fuse box "Panel LPS 5 Amp Fuse",

The Yellow wire is connected to the Radio 10 AMP Fuse.

Hope that helps.

I would make sure that you are getting +12 volts at the harness with the yellow and black wires (ignition on).

//2000CAYukon

whatis the brown wire for like i mean wuts park lamp? like the yellow lights in front of the truck? wuts that have to do with the radio

whatis the brown wire for like i mean wuts park lamp? like the yellow lights in front of the truck? wuts that have to do with the radio

Yes it is the yellow lights in front of the truck. At night time, it will dim the display lights of the radio. It is not required to use it.

Are you putting a stock radio in or is it aftermarket?

//2000CAYukon

well ifigured out why nothing would work was because the fuse was blown. well its all hooked up now and working but thanks for all the info

Need help i am trying to install an a alarm sys in my 88 1500 and the box under the dash below the fuse box on the fire wall it just says green white and so on but it is sayying that all over the box i am trying to under stand what is for what so i can run power out of there as to work the door locks and windows relay roll up

Huge88- I am having difficulty trying to figure out what exactly you are trying to figure out. Please clarify your question so others can heo out