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12-31-2004, 03:41 PM
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Join Date: Oct 2004
Posts: 28
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I want to add lights under the dash which is connected so they turn off/on with the courtesy/dome lights. Does anyone know where to tap into the 12V line for the courtesy lamps? It appears the lamps are controlled through the door modules so the 12V doesn't come through the wiring harness. The dimmer and override switch in the dash seem to control a relay or electronics in another location. Any help would be appreciated.
Thanks
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12-31-2004, 03:41 PM
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Join Date: Oct 2004
Posts: 28
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I want to add lights under the dash which is connected so they turn off/on with the courtesy/dome lights. Does anyone know where to tap into the 12V line for the courtesy lamps? It appears the lamps are controlled through the door modules so the 12V doesn't come through the wiring harness. The dimmer and override switch in the dash seem to control a relay or electronics in another location. Any help would be appreciated.
Thanks
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12-31-2004, 03:41 PM
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Join Date: Oct 2004
Posts: 28
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I want to add lights under the dash which is connected so they turn off/on with the courtesy/dome lights. Does anyone know where to tap into the 12V line for the courtesy lamps? It appears the lamps are controlled through the door modules so the 12V doesn't come through the wiring harness. The dimmer and override switch in the dash seem to control a relay or electronics in another location. Any help would be appreciated.
Thanks
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12-31-2004, 05:05 PM
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Hummer Professional
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Join Date: Nov 2002
Location: La Porte,TX
Posts: 391
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Here is the schematic for the circuit. Hope it helps. Didn't print very clear, but you can pick up the circuit in the under dash I/P relay box (by your left foot) connector C10 (12way natural color) terminals # C or B. Rt click the picture an "save as" then blow it up, you might see it clearer.
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12-31-2004, 05:25 PM
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Hummer Professional
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Join Date: Nov 2002
Location: La Porte,TX
Posts: 391
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I/P relay block
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12-31-2004, 05:41 PM
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Hummer Professional
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Join Date: Nov 2002
Location: La Porte,TX
Posts: 391
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Connector C10 pin outs,circuit #690, gray/blk wire color
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01-02-2005, 12:21 PM
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Join Date: Oct 2004
Posts: 28
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Hummie2 - Thanks for taking the time and finding this information. It's greatly appreciated and I owe you one!!
Happy New Year
Jim
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01-02-2005, 03:43 PM
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Join Date: Aug 2003
Location: \"Lost Wages\"
Posts: 1,150
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Good idea. What lights are you going to use?
__________________
Jonahs
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01-02-2005, 06:56 PM
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Hummer Authority
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Join Date: Nov 2004
Location: Little Rock, Arkansas
Posts: 1,784
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I saved all images to My Pictures and they come out a little clearer. Jimages be sure and let us know what kind of under dash lights You use.
Rick
__________________
05 H2 SUV cus. paint, Magnuson SC 6/12lb boost, cowl hood scoop, 12" dash touchscreen, GM elec. fans, HPTuners.com tuning soft., Dynatech headers dual catback exhaust Jet Hot chrome front to back Flowmaster Super 40's, Diamo 8 Karat rims & 325X60-20" Toyo, 4 OEM Captain seats Katzkins leather, rear console computer inside running all AV/NAV etc., Infinity component system 3 amps Tsunami Caps, rear flip down 12" monitor, headrest monitors, overhead console boost, fuel pressure, & A/F ratio gauges
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01-04-2005, 06:08 PM
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Join Date: Oct 2004
Posts: 28
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Actually, I haven't gotten to what lights I'm going to use.  I do photography and keep some stuff on the passengers side floor when I'm out and about and don't have enough light to find things. I wanted to make sure I could get it wired before I went out and bought the lights.
I also decided to go get the wiring diagrams so I wouldn't have to pester you folks too much. I found the '05 Hummer is on the GM CD's that the Corvette Dr. sells (found on a Google search) http://www.corvettedoctor.com/esi200...infomation.htm
Thanks for your help and I'll keep you updated on what lights I go with.
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