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Old 10-04-2018, 06:37 PM   #1
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MBS 2400W Blue wire under driver's seat

I was looking under the driver's and found an unterminated blue wire. I don't know if it should be connected to something or not. Anybody else see this wire?
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Old 10-04-2018, 07:53 PM   #2
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Found it in another thread.
What is this light

just kidding of course
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Old 10-20-2018, 01:59 PM   #3
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Possibly the trailer brake actuator to 7-way recepticle.
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Old 10-20-2018, 04:13 PM   #4
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I verified that on my 2018 MBS, the terminated blue wire under the seat is connected to the 11:00 o'clock blade of 7-way trailer recepticle. That is, looking at the trailer-side plug from the recepticle side, with the external bump guide down, it is the blade in the upper right quadrant. The standard wiring calls for that to be +12vdc from tow-vehicle-installed controller to activate electric brakes on trailer. Note that the adjacent blade in the upper left quadrant is ground. I have no such controller and am now wiring my trailer harness to feed the trailer brake indicator light from my Duo-Stay-In-Play brake installed in tow vehicle back to led indicator lamp I am installing in dash below radio.
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