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Old 05-08-2019, 06:02 PM   #1
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? Voltage out of Rv Tow Plug

2014 E 450 With engine running lights on what should my volt meter read? Touching each pin and ground . And is the center pin a always hot 12 volt?
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Old 05-09-2019, 11:57 AM   #2
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Here's a diagram of the Bargman plug.
As you can see;
Pin 1 is Ground
Pin 2 is Brakes (no power unless controller is active.)
Pin 3 is Tail lights (12 volts when lights are on)
Pin 4 is +12 Volts (12 volts from vehicle)
Pin 5 is Left Turn/Stop (+12 volts when brakes are on, intermittent when left turn signal is on)
Pin 6 is Right Turn Stop (+12 volts when brakes are on, intermittent when right turn signal is on)
Pin 7 is Backup Lights (12 volts when vehicle is in recverse) NOTE: (Also used for aux charging in some installations, and camera power in some installations.

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Old 05-09-2019, 02:45 PM   #3
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? Voltage out of Rv Tow Plug

Ok so plug 4 will be hot . And I could draw off that to my toad battery to keep in charged while towing ?
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Old 05-09-2019, 03:12 PM   #4
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Yes, just keep in mind that it doesn't provide much amperage.
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Old 05-10-2019, 01:03 PM   #5
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The center pin can be used for backup lights on a trailer. But on your E450, the center pin supplies 12 volt power only when the TV ignition is on. On our 2500TS, we had a toad and used that pin to supply power to a battery maintainer attached to the toad battery. When the TV ignition was off, the power was terminated to the toad and, thus, no battery drain.
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Old 05-10-2019, 01:08 PM   #6
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Ok thanks
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Old 06-28-2019, 08:57 PM   #7
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? Voltage out of Rv Tow Plug

I am getting unexpected results testing the voltage at the TV plug. Brake output set to highest level. Testing the brake voltage I get only 6.5 volts when depressing the brake pedal. However, when using the manual controller I get a full 13+ volts. Iím not sure why I get only half the voltage with the brake pedal.
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Old 06-28-2019, 09:07 PM   #8
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If it's a proportional brake controller like a Prodigy P3, you won't get full voltage to the brakes unless you are moving and hit the brakes or pull the manual lever on the controller.
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Old 06-28-2019, 09:19 PM   #9
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Thank you myredracer.
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