Yes, I've checked with volt meter. I get hot wire from red and yellow. But when I do connect yellow to yellow and red to red, still nothing.

And fuses are all fine. No burnt.

Let's see.

1998 K1500, I've read online wiring diagram. Here it is.

Radio Battery Constant 12v+ Wire: Orange
Radio Accessory Switched 12v+ Wire: Yellow
Radio Ground Wire: Black
Radio Illumination Wire: Gray
Stereo Dimmer Wire: Brown
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

Okay, so I put Pioneer DEH-1300MP in.
http://www.pioneerelectronics.com/PUSA/Car/CD-Receivers/DEH-1300MP

The Pioneer doesn't have an Orange wire. So, I assume it's red. Tried red/orange. Nothing. Red/Red, Nothing. Yellow/Yellow, works but something is wrong with Red. Works only with Red/Yellow. I checked with a volt meter and it's hot. All wires are hot.

Bought Harness from crutchfield
http://www.crutchfield.com/p_120701858/Receiver-Wire-Harness.html?tp=2977

Still, nothing works. I check with volt meter from harness. It's hot.

Edited:

I don't know if this matters but I had this in the truck
http://www.pioneerelectronics.com/PUSA/Car/CD-Receivers/DEH-1400

Had that radio in when I got the truck couple months ago. I decide to switch out radios and now it doesn't work. It was working fine with the old radio in. I tried putting back the old radio and now it doesn't work either.

This post was edited by SlashDash on Jan 22 2013 01:21am

You didn't hook up the remote wire did you..... Its the blue one from the HU.

ok so your truck harness is plugged into that harness you bought from crutchfield and he wires coming from that added harness go like this:
red: 12v acc ( i was refering this as the ''switch on'' wire in my previous posts)
yellow: constant 12v
black: ground

that 1300mp radio goes like this
yellow: constant 12v
red : 12v acc
black: gorund

so the correct way to wire them is yellow to yellow and red to red, but you have tried this already, plz confirm the following.
so you do get 12v from the yellow even tough everything is turn off no key no nothing?
and you do get 12v out of the red wire only when the key is turned to acc/on?

If this is the case maybe the red goes to yellow on one end and yellow goes to whatever you were plugging read into....

Just saying my c1500 silverado not all wire colors match up, use a wireing harness and a diagram. If you need help Pm me, my c1500 is the same as your k1500.