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Old 10-04-2014, 01:33 PM
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HalnasLT1 HalnasLT1 is offline
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Default Wiring to hook up high mountcap light

Hi.... I just purchased a new cap for my truck. The dealer wouldn't do the wiring to hook up my high mount brake light.
Where's the easiest place to grab the power for this? From the Drivers side tail light or go down into the wiring harnass?

I want power for the inside cap light too....

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Old 12-15-2014, 12:37 AM
rem26 rem26 is offline
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Bump, looking for the same thing. I understand there is a CHMSL wire on some trucks, but I'm guessing I am going to have to pull the dome light power from the trailer tow connector. I'd like a clean way to splice into there using factory connectors - I was thinking about getting an 'in the bed gooseneck towing wiring adapter' and then just cut the end off, repurposing the in the bed end to drive my cap.
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Old 12-15-2014, 05:43 AM
earlzach earlzach is offline
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Just a heads up it is all done from the tail light.

Tap into brake light of course and ground. As for a source for an interior light you wasn't to turn on your night time running lights and get the power from that. This way your light isn't on during the daylight. This does kinda suck if your just going out to your truck to grab something but I feel its worth not having it on all day while parked and kill your battery. Which is the worst? Ill take a second to hit my park lights.

I should mention an nice two or three pole plug and two low amp in line fuses on cap side is a must. Lets you remove the cap with the plug and protects your trucks circuit with the fuses. JM2C.
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Old 12-15-2014, 08:04 AM
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Etrailer: Pollak Custom Fit Vehicle Wiring for the 2012 1500 by Ram I purchased this and ran it behind the driver side tail light and into the box through stake pocket. I did not put the 7 pin end on I ran the wires to a Trailer Wiring Junction Box so then i have junction point for all functions of the 7 pin plug.Order the correct harness for your truck and junction box install and done, super easy.
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