I have a 96 blazer and im installing an aftermarket radio and when i wired it and tested it out it wouldnt turn on. the power wire works good but the constant wire isnt. I know the constant wire is orange (correct me if im wrong). OR shuld i just run a wire from the batt. and if i did that how would i?

 

i would go back and check the fuse panel in the door jam one the drivers side to see if there are any blown fuses. you are correct with the constant is the orange. but its most probably a fuse that is blown.

 

Don't know what year your truck is but my (1994) W/D says that the Orange wire constant with a 10 amp in-line fuse in it. This keeps the clock and presets, etc. working when the key is off. The yellow wire is what supplies power to the unit when the key is in RUN or ACC. You have others for dimming the display (Brown - when you turn on the parking or headlights) and backlight dimming (Gray - when you turn down the panel lights at nights). Hope this helps.

 

thanks that helped with the diming problem i had :P
so theres a inline fuse? cause i think that might be the problem i checked all the fuses and they are all good.

 

Still don't know what year you truck is but yes, the 94 factory W/D says there is a 10 amp in-line fuse on the Irange wire to the radio. It's pretty detailed. The wire comes off a splice behind the instrument panel on the left side (of center) near the instrument cluster. I'd find the wire and just follw it back. Kind of a pain. Can't believe GM would put an in-line in a production vehicle but there it is.

 

Right in the first post GB!
To the OP, have you tested for +12V on the orange wire? Sounds like you have, but I just want to make sure. Also check the ground for good continuity.

Here is a schematic showing the power side of the radio:

 

ill have to check the inline fuse then

 

Based on the wiring schematic I posted above which is for your truck, there is no inline fuse.

 

then what happend to the wire?

 

swartlkk
Finally got my head out. Sometimes you just don;t see stuff that's right in front of you.
blazinup101
He's right. I guess on the Gen 2 Blazers they did away with the in-line. I was quoting from a 94 W/D (last of the Gen 1). Comparing my W/D to this one there are a few differences in the power circuit. Not big ones but enough to screw you up. Didn't mean to steer you wrong.