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Old 03-29-2009, 04:00 PM   #1
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Default 4 pin to 5 pin plug for trailer lights

I have been having trouble with my truck so we're going to us a buddy of mines for a trip tomorrow. The problem is...he has an older 2500 ram and he only has a 4 pin trailer light plug. My trailer uses a 5 pin for the brakes. How can I convert this? Thanks
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Old 03-29-2009, 05:06 PM   #2
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The 5th pin that disconnects your breaks works off of your reverse lights so you could figure out which wire becomes "hot" when you put truck in reverse, splice a seperate wire into it and crimp a pin connecter on the end.

If it were me however I would not worry about wiring it because you have a 4 way flat which means all your running, brake and blinker lights will work.
The only thing that will not work is your brakes will not dissconnect when you put truck in reverse (the brakes could lock up). This can be resolved by placing something(pin,2x4 etc) to prevent the actuator from surging back and forth.
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Old 03-29-2009, 05:21 PM   #3
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I just went through this same thing. I have a Venture trailer which required 5 flat, and my older truck was rigged with a 4 flat. I was able to find a 4 to 5 adapter at a local auto parts store. the adapter fits onto your existing 4 prong plug, and has an extra blue wire which gets wired to your reverse lights. I was told that I could "hot wire" the plug so that the electric brakes did not engage, but I like to have everything working the way was designed to work. I could not put my trailer in reverse without the 5th prong to the reverse lights.
I believe that I found the adapter at Car Quest.
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Old 03-29-2009, 05:27 PM   #4
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When my trailer first showed up there was a small problem. I won't get into the details as it doesn't matter. Anyway, I was able to inset a 3/8 drive extension into the brake actuator slot and it prevented the brakes from becoming active while backing. You remove it during travel and slip it in when you need to back up.
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Old 03-29-2009, 05:31 PM   #5
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Plug in the 4 prong while driving so all the lights work(brake, blink, drive) . When you need to reverse get out and flip the adapter over. Turn on the headlights. This will activate the brake lockout, of course your trailer lights won't be working...
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Old 03-29-2009, 06:54 PM   #6
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Thanks for all the help. I found the adapter that christo was talking about. Thanks
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