Changing Electrical cord from 7 round to 7 flat - How to?

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The OP wants to change the trailer to the NEW style industry-standard Pollak 7-pin flat, which I'd highly recommend in case he ever needs anyone else to be able to tow the trailer.

I'd be careful and chase each wire since the 1996 and 2000 Jayco Designer 5th wheels I owned came with the Pollak 7-pin flat. If the Jayco you're looking at has a 7-pin round, that's non-standard for the Jayco and there's no telling how the previous owner had his truck wired.

Here's Pollak's standard for a 7-pin round:



Here's Pollak's standard for a 7-pin flat:



Rusty

I would just change the plug on the truck to the same as the trailer. You can get the socket with wires at Tractor supply or off the internet. If you change the trailer to the old style and have to upgrade the truck you will be in the same boat again with the old style connector on the trailer.

Buy a flat/round pin adapter? :h

Lyle

$27 New trailer pigtail 7 blade
$6 New 7 blade plug

Examples

Wiring Info


Take pics of old wire connections BEFORE disconnecting wires........:B

Just switch it out. It's hard. Most packages have diagrams and instructions on how to do it.