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Shown in pic is the back of the transfer case switch which has two plugs. What is the third large unused plug for? I’m putting this POS back together for the day so I can run to the market and do an oil change on it.

So not needed for this Pioneer head unit.

On the bottom of the GM side Metra plug I have a Green and Green/White pair of wires which are not connected. Manual suggests the Dark Green/White is for Transfer case control module with Electric shift. WTF is it doing in a plug for the old stereo? Again a diagram showing wire colors to pin...

GM side Metra plug. L to R 6 wires: Yellow (missing in pic), Orange (missing in pic), Pink, Grey, Violet/White, Black. Yellow is Hot in ACCY and Run. It is connected to Yellow at the Pioneer (P) harness plug which is power regardless of ignition position. Orange is hot at all times. It is...

RPO sticker:

On the plug to the Pioneer head unit, I have three wires not used/connected: Reverse gear input is for a back-up camera, which I do not have installed, nor intend to. System remote control not used. It came with a remote fob, but I have no intention of using it. Mute, I assume is for muting...

No XM satellite. That came into play about 2001. The middle section of my RPO codes have rubbed off the sticker.

Center portion of the RPO code sticker is rubbed off, so I do not have all of the RPO codes. If it were Bose, it would be advertised all over the truck.

No On-Star. No CanBus

2nd paragraph^^^

I don’t know what system it has. It is a 1999, not early to mid-2000s which would make it a GMT-800.

I think I may get a BOGO out of this. I installed a Pioneer AVH-2550NEX head unit. Got everything work except the the speakers, where I only have the front tweeters working. I used a Metra Plug to the Pioneer Head unit plug. They say the wires are color matched, which should make it easy. There...

Thank you. I have some recreational detour (river clean up and fishing) today and will get back at the truck electrical tomorrow.

15.2 mpg while towing is very good.

Here is my pic: That metal box is all that I’ve got there. The plug has 3 rows of pins in it, while the shop manual shows a plug with two rows.

Got the $50 driver’s seat from salvage cleaned up. Had my wife pick up a bottle of Folex spot carpet/upholstery cleaner from HD. She went to town on the seat and just raved about how well the Folex stuff worked. I followed that up with the upholstery attachment on my Rug Doctor carpet machine...

No alarm installed or removed during my ownership and the rear actuator worked until recently. Already probed the leads and contact buttons, no voltage. Took Emory cloth to the contact buttons at the door. Tested it with door closed (thus connecting the contact buttons) and nothing. Manual...

I will check tomorrow. Just learning how to use these manuals.

Right side of steering column under dash, I see nothing on left side of depicted bracket: Right side of that bracket, I see two plugs, neither of which look like the one in the picture. The first pic is the plug to a metal box attached to the bracket. Second is the plug to a plastic box...

It shows it, but does not show where: