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Trailer wiring

Started by BIGSHOW, July 24, 2013, 01:08:25 AM

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BIGSHOW

I am buying a Ranger boat and I noticed when looking at The trailer wire the plug had 5 prongs. Although my old one had brakes it only had 4. My 2011 f-150 has a standard 4 prong and a round plug i've never used. My question is.. Is there a adapter for the round plug to go to a 5 prong or do I have to get the 4 to 5 prong adapter and tap into my reverse lights? Thanks in advance for any help

mikesmiph


thedude

There is an adapter for Round to flat-5 and it will work with the brakes/backup lights.  You can also cut the flat-5 off the boat and just wire the 5 wires into a standard round connector, you will just have 2 terminals unused on it.

Additionally, you can usually plug a flat-5 into a 4 in a pinch. The wires line up correctly from the ground, the 5th wire just doesn't plug into anything.

In most cases, all the 5th wire (brakes) does is disengage the brakes via a solnoid in the tongue of the trailer so you can backup without engaging the brakes. Most systems have a manual way to lockout the brakes as well so the 5th wire isn't always necessary.
West Michigan Bass www.westmichiganbass.com
Palehorse Custom Rods

Lightningboy

The dude is correct.  The fifth wire (blue) is a reverse lockout that disengages the trailer brakes so you can back up.  You can manually block the surge brakes, but it's kind of a PITA to have to every time you want to back up.

I extended the blue wire along the trailer frame to a small set of amber clearance lights on the back of the trailer.  They only go on when you are in reverse.  Makes it easier to recognize my trailer comming down a busy ramp after dark.

All you need is a 5 flat to 7 round adapter.  It's just plug and play, no wiring needed.  You may need to check a few places, as 5 flat is mostly a boat trailer plug & not all auto stores carry them.

BIGSHOW

I called a few places and they said that you can get an adapter from the round plug to a five prong so everything works

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