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Interior Lights Under Dash - Gmt 900

1990ss

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1990ss Enthusiast

1990ss

Posted
Posted

I was wondering if anyone has installed the 194 style bulbs under the dash in each corner of the truck like the previous generation trucks had. If so, can you post how you wired them up?

 

Thanks

Diesail Enthusiast

Diesail

Posted
Posted

The power distribution block near the brake pedal. There are two sources, cavity X9 Pin 6 White/Black wire and cavity X12 Pin 6 also a white/Black wire.

sonjaab Senior Enthusiast

sonjaab

Posted
Posted

There were posts from 03 and up gmt-800 owners that even tho GM de-contented the floor lights (underhood light, side moulding, power port, and other stuff) that the wires/sockets/holders were still in place under the dash !!!!!!!!!

 

My 04s were and I just installed the bulbs!

 

I wonder if the gmt-900s have them hidden up there somewhere?

1990ss Enthusiast

1990ss

Posted
  • Author
Posted

Does anyone have a service manual with the wiring diagram for the courtesy lights? I just need to know what wire to splice into so I can wire up the sockets.

Diesail Enthusiast

Diesail

Posted
Posted
Does anyone have a service manual with the wiring diagram for the courtesy lights? I just need to know what wire to splice into so I can wire up the sockets.

 

 

Did you see post #3 above? More details can be found in this manual GM 09_LD_GMT900_Elec

1990ss Enthusiast

1990ss

Posted
  • Author
Posted
The power distribution block near the brake pedal. There are two sources, cavity X9 Pin 6 White/Black wire and cavity X12 Pin 6 also a white/Black wire.

 

What is X9, X12, and pin 6? Are the plugs numbered that plug into the distribution block?

 

Once I find the right wire, should I just be able to splice into in with a scotch lock and run the wire to my lights?

  • 3 months later...
TDImark Enthusiast

TDImark

Posted
Posted

Yes.

 

I just installed the missing footwell lights on my '08 Silverado last month. It took some time to find the "right" wire to tap into, but I followed the dome light wire (light gray) down the A-pillar to the fuse block under the dash and just left & above the brake pedal. It is Pin 8 in the black wire harness connector (2nd down on the right side) -- at least on my truck. All the harness connectors have a unique color -- in my truck -- so it was hard to mess it up! See page 5-130 for info in the truck's owners manual.

 

The next challenge was finding a spot to suspend the little 194 sockets under the dash. On the driver's side, I secured the socket to one of the screws that hold the computer access plug in place; on the passenger side, i unscrewed the glove box and slipped a bracket behind one of those screws holding the glove box to the main dash. I wired them both in parallel -- I grounded each bulb to the truck so each could receive full voltage.

 

It was pretty easy after I found the right wire.

 

Here are some pics:

 

67eb4838-1.jpg8e415c7d.jpg0a352a6b.jpg

 

 

yellow arrow is pointing out Pin 8 -- the gray wire is under the white wire that I used to hook up the circuit.

 

Hope this helps!

 

Mark

Pumper Enthusiast

Pumper

Posted
Posted

Thanks for the idea. Does anybody know the wire and position for a GMT 900?

elmo Enthusiast

elmo

Posted
Posted

The post above your's is for the GMT900

 

Thanks for the idea. Does anybody know the wire and position for a GMT 900?
Pumper Enthusiast

Pumper

Posted
Posted

Wow...I was really paying attention on that one. Thanks.

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