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Gmt900 4wd Gauge Light Adapter

cgalford

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cgalford Enthusiast

cgalford

Posted
Posted

I really hated, like a lot of others, that there was no 4wd light in the dash so I was going to just wire up another led and diode isolate it like what was done here:

http://www.gm-trucks.com/forums/index.php?...5545&hl=4x4 light&st=30

 

But when I took apart the selector knob I discovered the 900's wiring was fairly complicated and adding additional current draw would most likely destroy the control module and the lights were dimmed when dark using a pvm signal so I developed a circuit to drive additional LEDs without damaging the OEM modules. I figured while I was at it I might as well put 2 colors in there so I chose yellow for Auto and red for 4H and 4L

 

http://www.youtube.com/watch?v=M9zzPDK6sT4

 

http://www.youtube.com/watch?v=9VCy-4vm-BM

 

I'm probably going to make this system available through my business with a step by step install DVD. Its about as hard as replacing the gauge faces or a stepper motor. Once it's ready I'll become a forum sponsor to sell them.

 

What do you guys think about the color choices (yellow vs red, not the color hue, that'll be fixed with the LEDs I have on order).

 

Also, is there someone in the SF bay area that would want a free one that I could film the install dvd on? I want a virgin truck, mine has reminants of my various prototype iterations.

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texasblueline Enthusiast

texasblueline

Posted
Posted

I agree, very cool. I didn't even realize until now that there was a vacant dummy light in the gauge cluster for 4wd....go figure that it'd only be used in the trucks with the manual transfer cases.

nqabigt Enthusiast

nqabigt

Posted
Posted
Nice work taking the initiative on something that could be quite useful

 

Ditto on the nice work, red would be fine with me for all :D

brims Senior Enthusiast

brims

Posted
Posted

I think you're going to have quite a few buyers, I would definately want that functionality if I had 4wd. Looks good. Doesn't make sense that GM wouldn't make that light work with an electronic transfer case, don't they do testing with real people that go "hey, I like this, but that sucks", bean counters strike again.

fbachman Senior Enthusiast

fbachman

Posted
Posted

Very nice... I would definitely be interested as well... With my seating position, and the trans selector in "D", the trans selector acts as a PERFECT obstacle so I can't see the selector what-so-ever.

 

I think this is a GREAT idea for an add-on product, FWIW. :D

cgalford Enthusiast

cgalford

Posted
  • Author
Posted
So, how'd ya do it?

 

 

Its a sensing circuit that taps into the wiring behind the switch then has additional components to drive the LEDs. For the LEDs it uses the gm lamp circuit which dims all the lights when its dark (everything that doesn't adjust with the interior brighness knob, like the lights the non-green lights in the gauge cluster). The LEDs are mounted in molded plug that fits the cavity inside the gauge cluster.

 

Price will probably be $90. This is based on low volume but if I get more orders then the price could come down as I order larger quantities of parts. I also chose higher quality connectors because I worked my way through college as a car electronics installer and have seen the problems caused by cheap stuff.

khancock Enthusiast

khancock

Posted
Posted

That really is a great idea. When I installed my gauge faces I was stuppfied as to why I had a vacant dummy light. The LEDs on the knob are a PIA to see in the day or the night. Great Job! :shakehead:

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