Can a 4-Way Flat on a Truck Be Used with a Trailer 5-Way Flat without Connecting Extra Wires

Question

Question:

I am going to be using a moving truck to haul our house and boat. The moving truck has a 4-prong and my trailer has a 5-prong flat. What is the simplest way for me to convert the moving truck to support a 5-wire, recognizing that its a rental? I watched the video and it seems straight forward except I dont want to open their light housing if I can avoid it. If I dont hook up the 5th wire to the truck, will this freeze the brakes when going forward - or is that wire only for reverse?

asked by: Chris H

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Expert Reply:

I recommend using the Adapter # 47515 or # 20036 and not connecting the extra blue wire to anything on the truck. On a 5-Way flat connector, the extra blue wire is normally for an electric reverse lockout which you find on a lot of boat trailers.

The brakes on the trailer are probably hydraulic with a reverse lockout on the coupler. The blue wire sends power from a reverse light circuit to a solenoid on the coupler that does not allow fluid to pass through to the brakes when the vehicle is in reverse. This is so you can back up without the brakes engaging.

If you will not be backing up during the trip, you really do not need to have that blue wire connected to anything. But, chances are that you will need to back up and not having the electric lockout can be a hindrance.

All you need is access to a reverse light wire on the truck and create a temporary connection from the blue wire on the adapter to the wire. I would call the rental place to make sure you can do it.

expert reply by: Michael H

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Answer 1

Normally, the green wire on the right side carries right turn signal and brake light functions and the brown wire carries running light functions. On the left side, the yellow wire carries left turn and brake lights and the brown wire again carries…

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Answer 2

You will still be able to use the trailer with the 4-Way after installing the 4 to 5-Way adapter, #20036. First, you could just remove the adapter if you wanted to and then plug in the 4-Way like normal while stowing the adapter in the truck. The…

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Answer 3

The part #3034-P brake controller adapter plugs into the connector beneath your vehicle's dashboard. To reach the connector, first locate the notch in the access panel in the center of the dash, near the passenger side. Using a trim panel puller,…

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Answer 4

Yes, we do sell bushings for use with trailer suspension systems. I am including a link that will show you all of the sizes of bushing that we have available.

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Answer 5

The B&W Silencer Pad #BWTS35020 is intended to be placed on the shank of one of their Tow & Stow Multi-Ball Mounts like #BWTS10048B so that it acts like a gasket between the collar on the end of the hitch's receiver tube and the…

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Answer 6

The Hopkins Adapter 7-Pole to 6-Pole #47549 plugs into a vehicle side 7-way socket and converts that connector format to a 6-way round-pin type. If you think you will need some length for your connection, #HM47083 is an alternative that does the same…

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Answer 7

I do have options for you but most of our frame mounted spare tire carriers are not designed to work with angle iron. That said, the CE Smith Spare Tire Carrier for Trailers part #CE22007Z-11050-2 we have found to work the best so that's what I…

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Answer 8

You're right, the mounting bracket is unique (in a good way) for the Curt TriFlex NEXT Trailer Brake Controller #C24VV. The bracket is smaller and all you do is put the included adhesive tape on the bracket and stick it wherever you like under…

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Answer 9

It is very unusual for 4-pole trailer wiring to get hot enough to melt the 4-pole plug. This wiring format carries only basic lighting signals, no trailer brake power, no reverse lights and no auxiliary 12V power. It would be much more common for an…

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Can a 4-Way Flat on a Truck Be Used with a Trailer 5-Way Flat without Connecting Extra Wires

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