2020 Cougar 26RBS wiring polarity confusion
Ok, so I finally finished my move to a new state and had the travel trailer repaired from the last round of issues with the wiring an the rear camera (which I posted in this forum and had great responses). The day I picked up the RV I purchased a new Furrion Vision S 7" VOS and because I did not have the means to install it while at the dealer I waited until I got the trailer and new camera system home to do the install (after all I was told it was just a matter of unbox, remove the 4 tiny screws on the Furrion mount, and then plug the camera/monitor in).
Well, crazy me....expecting things to go well....which they did not. After installing the camera system and turning on the truck lights the monitor would come on but not the camera. So before going crazy with things I connected the camera to the pigtail on the monitor power plug and sure enough it works as it should.
What this meant for me now was trying to figure out what I was not getting any power to the camera when it was plugged into the factory supplied power pigtail on the back of the rv, after all all the running lights worked just fine.
So after trying every possible combination of truck lights on/off (and using a DVM while doing this as well) and various on/off switchs on the RV I finally removed the center clearance light (just above the factory supplied Furrion connector) and extracted the wiring connections. and what I was greeted with was multiple sets of black and red wires connected together (there is roughly 3 groups of red/red and black/black connections) and one of these had the black and red wires from the camera power cord connected to the properly color coded wires.
Since I was at a loss for what was going on and wanting to validate my sanity I placed the positive probe of my DVM onto the red/red/camera power supply red wire and my negative DVM probe onto the black/black/camera power supply black wire and too my surprise the DVM read -12v (if I switch the connection of my DVM to the DVM's red probe (positive) touching the black/black/camera power supply black wire and then the DVM's black probe so its touching the red/red/camera power supply red wire the DVM now reads +12v DC.
So this brings me to my confusion: Why would the polarity on the travel trailers clearance lights be reversed when compared to the color coding of the wires? After all common sense would dictate that red connects to red and black connects to black and then all things are positively happy (granted you should never really trust the color of the wires but common now, standards should be used so that someone does not have to use a DVM to test every frigging little detail all the time).
BTW: Sorry for the long post, I just could not figure out a better way to explain the issue I am seeing.
-- Michael --
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