Wiring Diagrams for 7-Way Round Trailer Connectors

Question

Question:

Im looking at my 7 pin cast body pollak round pin receptacle vehicle side pin labels on the screw side of the terminals and they are labeled differently than in your color diagram. The male trailer side plug is correctly labeled but the body side connector has the yellow and green wires reversed in position. For that matter - black and brown are reversed also....unless that view is supposed to be down the barrel of the connector, in which case, for clarity, the screws should not be shown. Sorry to be picky but I was wondering about this for some time before I figured it out. Happy Holidays

asked by: David H

0

Expert Reply:

I attached a diagram that shows how most 7-way rounds like the # PK11720 that you referenced will get wired up.

As long as you got yours wired up correctly and your trailer taillights and brakes are functioning correctly that's all that should matter, but occasionally there are some trailers that end up wired slightly different than others so the diagrams we offer don't match up perfectly. In those cases you have to wire up everything by function so that everything matches up properly. Otherwise you will have to rewire up the trailer or vehicle so that it matches the standard wiring diagrams.

expert reply by: Jameson C

0

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Answer 1

On a 7 pin round which is the common connection on a semi trailer, the clearance/marker lights are at the 10 o clock position when you look at the trailer wiring connection. When looking at the connector on the back of the truck, that will put the…

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Answer 2

While unlikely, it is certainly possible that the trailer battery could backfeed to your vehicle's battery when hooked up under the scenario you described. To make sure this doesn't happen all you need to do is add a single diode like…

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Answer 3

The correct way to fix this would be to install a battery charger like #20011 on each of your break-away systems. This is a reasonably priced option that will prevent the overcharging of your breakaway battery and will also prevent the back feeding…

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Answer 4

You would not be able to charge your battery through the wiring on your 4-way trailer connector. Since your truck has a 7-way connector, you could maintain the power to the battery but not charge it. To begin, you would need to cut off your 4-way…

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Answer 5

When wiring a trailer connector, it is best to wire by function, as wire colors can vary. We have an excellent wiring diagram on our website, I will provide you a link so you can look at it. If you are looking at the inside of the trailer connector…

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Answer 6

Lance does have a proprietary plug, but many customers see a standard 6-way or 7-way round and notice it doesn't fit their factory 7-way as well. I've attached an article to help if you have one of the 7-way or 6-way round connectors which we…

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Answer 7

The Pollak Heavy Duty 7-Way part #PK11720 that you referenced is a heavy duty style 7-way. If you check out the attached diagram you'll see how it should be wired.

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Answer 8

On the back of the Pollak 7-Pole, Round Pin Trailer Wiring Socket - Vehicle End, part #PK11720, it is marked alongside the pin with the color of the wire that connects to that pin location. I am also including a photo that will show a 7-Way round pin…

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Answer 9

There should be a sticker or plate on the pin box itself that lists the manufacturer and model of the pin box. If it is not present then there are some measurements you can take to determine the model of the pin box. I have included a link that…

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Answer 10

We likely have a toolbox which will work with your Aluma 548 trailer although A-Frame toolboxes are not made specifically to fit certain trailers so you will need to know the amount of room you have to fit the box. I do recommend going with a plastic…

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Answer 11

Thank you for the photo of the brake assembly from your Dexter SLR D-90 9K axle. The correct hub you need for your Dexter D-90 axle is the part #8-430-5UC3 which includes bearings, races, oil seal, oil cap, wheel bolts, and lug nuts. With this hub…

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Answer 12

Below is the general process for bleeding an electric over hydraulic brake actuator like #K71-650. Fill reservoir with NEW brake fluid. Never re-use brake fluid that has been salvaged or removed from another system. Remove the key from the breakaway…

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Wiring Diagrams for 7-Way Round Trailer Connectors

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