Duramax Diesels Forum Truck of the Week
  #16  
Old 12-14-2016, 05:58 PM
bmc1025 bmc1025 is offline
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Ill attempt to wire this up tomorrow with a relay. Before my last post I was in a parking lot waiting for someone so I used some pieces of wire and jumped the blue wire to the ground on my led strobe bar and aplied +12 to the other and it operated without pulling the BCM low enough to turn on the cargo light. The bar has over 50 leds and a microcontroller for the patterns.
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  #17  
Old 12-14-2016, 06:01 PM
bmc1025 bmc1025 is offline
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White trash I will try to take pictures tomorrow.

Does anyone know of a confirmed place to get RAP +12v
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  #18  
Old 12-14-2016, 07:20 PM
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Use a 5 pin Relay. Center pin is 85A wich has continuity when relay is not activated. USe the 12V cargo + source to activate relay then when you press the Cargo light you lose the 12V and the relay will turn off which will initiate continuity through pin 85A.
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  #19  
Old 12-14-2016, 07:31 PM
bmc1025 bmc1025 is offline
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That would work also. I'm not convinced it is a NC switch though. I think it applies ground to the bcm when pressed. I will find out for sure tomorrow.
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  #20  
Old 12-14-2016, 08:44 PM
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Post pics if you get it worked out, curious on wire routing etc...
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  #21  
Old 12-14-2016, 10:20 PM
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Mexican joke? Sup with that.... hahahaha just pressing buttons man! Your in vegas? How are the dunes to the north? I heard you guys have petroglyphs in your canyon walls?
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  #22  
Old 12-15-2016, 08:43 PM
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I didn't get time today to work on this. A "simple" tire change turned into using a torch to heat up lug nuts on every wheel just to get them off.... Joys of owning plow trucks!
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  #23  
Old 12-17-2016, 10:21 PM
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No worries, I know how that goes. I haven't had a chance to mess with them the last couple days anyway.... Busy week getting things closed up before the holidays. Appreciate you trying it out when you got time.
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  #24  
Old 12-18-2016, 03:20 PM
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I think you guys are over thinking it.

If you want your new bed lights to be controlled by the cargo lamp switch, find the cargo lamp control at pin A6 of the BCM (It's a ground control) and connect that to terminal 85 on the relay. Connect +12 to terminal 86 and 30 on the relay. Connect terminal 87 to the +12 side of your bed lighting and find a chassis ground for -12 for it.
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  #25  
Old 12-21-2016, 07:30 PM
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Attach 85 to the blue with white stripe wire or terminal f on the connector. Connect 86 to a fused positve. When the cargo light is turned on the relay will activate. Connect 30 to fused positive and 87 to your new lights.

86 and 30 can be pigtailed to each other to save running extra wire.
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  #26  
Old 10-11-2017, 09:51 PM
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Wanted to bump this up as Iím getting ready to do the same thing on led bed lights wire them to be controlled by the cargo lamp switch in the truck. Would it be ok to fuse tap constant power and then ground to the Cargo Lamp Low control wire (Dark Blue and white) at the switch? If not what is the proper way to wire to get functionality from the switch?


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  #27  
Old 10-15-2017, 01:41 PM
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I had 2 strand wire on hand when I did mine, so I got power and ground from the cargo light.

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  #28  
Old 10-17-2017, 02:30 PM
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Yea I suppose thatís probably the easiest


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