7 blade trailer plug please help... On Kaufman trailer....

My brother used my trailer and ripped the plug out. Needed to haul a tractor tonight so I picked a new plug up and we tried to wire it up with no luck. Here are my issues the replacement plug is a Hopkins. Starting from top going clockwise the plug says white red green black brown blue..... However my trailer wires are white green yellow brown and black...I tried using the colors and improvising with the others, we had no luck... Any body have an easy answer for this?

Google "trailer wiring diagrams" my experiance is that as soon as I think the trailer is wired correctly with colored wire it ain't. So mabe stuff the wires in the connector on the truck and when everything works right hook it up in the trailer plug

white is ground, green is left turn, yellow is right turn, brown is tail & clearance lights and black is brakes

See if this link helps
trailer wiring

So here is a diagram of the colors and what they do for the plug. However your trailer is wired different, yellow is left green is right, brown is marker lights, white is ground and I believe black is brakes. The black and white on your trailer I might have backwards but the others I am sure about. Ithe way I remember it is green has a r for right and yellow has a l for left. Somebody else already responded and had the green and yellow mixed up.

Didn't post the diagram the first time here it is

The wire colors on the trailer should be
brown; clearance
green; right turn
yellow; left turn
white; ground
blue/black/red; brakes. Blue is usually brakes, but some 7 wire cords don't have blue so a different color is used. Some also don't have a white wire, then black is ground and red is brakes.
These don't match up to the plug colors so here goes
brown wire to green terminal
green wire to brown terminal
yellow wire to red terminal
ground wire to white terminal
and what ever wire is brakes to blue terminal.

Any time the wire color and pin location is right and proper is a rare day.
If you have a test light, pen and paper start with the truck and hook the test light clip on the truck on a clean ground location.

With the ignition turned on, nothing else probe the plug for power this will be your auxillary or charge power terminal [if it is wired in on your truck]

Turn on your left signal, probe the plug and mark down where that terminal is, do the same for the right signal.

Next turn on the running lights, probe and write down.

Asuming you have an electronic brake controller, have somebody watch it while you probe the plug until the controller light comes on to indicate trailer is connected, this terminal is your brake wire.

Put truck in reverse if there is now power at a terminal that didn't have it before mark it down. [again may not be wired in on your truck]

Now you have one to three terminals left to identify if you only have one left it is the ground, if you have two or three left hook one end of your test light to the terminal you identified as running lights and turn them on, probe the remaining terminals with the other wire from the test light until your test light comes on, this is your ground and the other one or two that did nothing [auxillary power and reverse lights] may not be wired on your truck.

On to the trailer grab a 12 volt battery hook the ground to a clean spot on the trailer frame.

Hook the positive lead from the battery to a 20 amp inline fuse and use this to probe the wires from the trailer, the one that blows the fuse is the ground.

Replace the fuse and probe the remaining wires to identify right turn, left turn and running lights, the running lights will be the wire that lights up a bulb on both sides at the same time. the last wire will be your brakes, alternatley if your ears are good you can hear the humm from the brake magnets.

Draw a picture, stand on your head looking in a mirror or write little notes on pieces of masking tape to get all the wires where they belong and you should be good to test and go.

I've wired a lot of trailers and all of the advice given this far is right on. The only thing I haven't seen mentioned is that when looking at the diagram on the plugs packaging, or wherever, just make sure that it's for the part of the plug your wiring. In other words if the diagram shows the socket end on the truck, and you try using that to wire the plug end, you'll get it wrong. Basically when the plug shows the different wires connected in a clockwise direction facing the front of the socket, the plug has to be wired counter clockwise, facing the front, to match. That will mess you up in a heart beat if you don't take that one little thing into consideration. Good luck.

Couldn't agree more.

I might differ a little in technique, but I think the important point is to never make the assumption that the last person to do the wiring knew/cared about what they were doing.

You'll save yourself hours of frustration if you take the time to go through each and every wire methodically, both on the truck side and the trailer side, and draw a detailed picture of the results, including pin location and wire color.

Store that picture in your truck and you'll thank yourself a few years down the road when you're doing something else with the wiring.

one other note - never assume the wire color on the trailer connector matches what comes out at the other end at the lights. Very common for that wiring harness to snap down below, and get rewired, sometimes very creatively - especially true if you bought the trailer used.

The colors written on the plug are wrong. It's been that way as long as I've dealt with 7-pin plugs.

I don't know why they do that.

I replaced the plug on a used horse trailer my wife just bought, and for the first time ever, the wire colors were all correct. When you think about it, its the wires that are wrong, not the plug- all the 7 pin plugs I've ever seen had the same wire colors on the same pins- its just the cables you hook them up to that have the wrong color wires (or the right color wires, but wired incorrectly).

unless it is a totally new installation the colors may be wrong--so use a test light and determine the function of each blade on your female and then determine the function of each blade on your male using a 12v power source and then match them up

Thanks too all of u got it done yesterday and got my 70 hauled.. It will be redding hay today..