Converting an Existing 9-pole Trailer Connection Plug to a 7-Way Connection

Question:

I am getting an older trailer with a 9 pole connector. My truck has a 7 blade. Is there an adapter I can buy that will handle this? I am not an electrician, so looking for an easy fix for this. Thanks!

asked by: Mike F

Helpful Expert Reply:

We do not supply a 9-pole to a 7-blade connector converter, but you can definitely convert your existing trailer connector to a 7-way blade connecter that will work with your truck.

To do this you will need a replacement 7-blade connector like # PK12706. You will then disassemble the existing trailer connector and install the 7-way blade style connector. When you take apart the 9-pole connection point the functions should be labeled, and you will want to match up functions to the 7-way not necessarily match color for color. You may want to use ring connectors to connect the existing wires on your trailer cord wire to the new 7-way connector plug, like the # 44-5310A and # DW05702-1.

Please connect the wires on your 9-pole to the corresponding functions on the 7-way connector plug according to the diagram that I have included. Note that there are 2 wires that will not be connected the gray auxiliary, and orange refrigerator or stop, please terminate these and wrap up with tape.

I have included a diagram showing the configuration of the two plug styles, and a short installation video of a 7-way replacement plug that shows the same procedure that you would follow for replacing the 9-pole connection on your trailer.

expert reply by: Rachael H