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Old 09-09-2019, 06:34 PM   #1
tech740
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Upfitter switch

I have an idea and would like to se what you guys think of it. I have upfitter (auxiliary) switches in my truck. I have a Furrion camera that runs on my running light circuit. I was thinking I could tap into the running lights on the 5th wheel and run them from the upfitter switch to activate the camera. I know I can just turn on the lights but I have a habit of not turning them off. The switch is key controlled. I am wondering if this would cause back feed in the circuit and not work as I envision it.
Let me know what you think.
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Old 09-09-2019, 06:45 PM   #2
chuckster57
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Does your truck have an option for “automatic” headlights?
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Old 09-09-2019, 06:49 PM   #3
JRTJH
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I believe you'll find that you have two "power sources" for the lights that way. You'll be sending 12VDC to the running lights from the upfitter switch AND 12VDC when the light switch is turned on. If both are on at the same time, you'll have a direct short and blow the fuse under the hood on your truck.

If you remember to turn off the upfitter switch before turning on the lights, I'm not sure what would happen. I have the upfitter switches in my truck, but I'm not familiar with the way Ford wired the upfitter switches through the ignition circuits in the "central computer" and whether there's an "always powered pin" somewhere that would cause problems for the upfitter switch wiring.

It used to be that you could look at a wire and tell where it starts and where it ends. With today's technology, that's no longer true. The "flux on the wire" controls the bias on a circuit in the computer and that determines what happens in the upfitter switches. Whether any of that would affect the bulb monitoring system in the computer through the headlight switch ???? They made them way too complicated for an easy mod.

If I were intending to power my camera from the upfitter switch, I'd wire a separate line with a separate plug at the 7 pin receptacle and run that line under the trailer to the camera. I wouldn't try to integrate it to the 7 pin/upfitter switch/headlight switch/sway control/stability control/brake control which are all tied together to monitor trailer performance....
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Old 09-09-2019, 08:52 PM   #4
tech740
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Quote:
Originally Posted by chuckster57 View Post
Does your truck have an option for “automatic” headlights?


It does. I just like to use the observation camera during the day. 43’ back is not something I am good at judging yet when changing lanes. Lol. So far the auto shut down has saved me and the truck protects the batteries. My worry is when they get weak over time it will he dead when I go to restart.
I was trying to avoid running a separate circuit to the camera at the rear of the trailer because all the wires are in the walls. Sounds like I may just have to live with how it is.
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