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

Baja Man wrote:
Can't I just use remove the wires from the old plug and place them into a new 7 blade plug? In the pics posted, the wires are set into terminals with set screws. Am I correct?

You could get fancy with some heat shrink ring terminals.
Otherwise yes you remove a wire and secure it to the new connector.

Plug on my Jayco appears to have been changed from original. It is a Cole-Hersee plug with 7 pin round. I bet original owner changed it to match his older Dodge Ram diesel plug. In a pic I saw with the trailer and truck, it appeared to be a late 80s early 90s Dodge Ram diesel. Older trucks had 7 pin round. How do I know...my 1992 Ford had one that was OEM until I changed it to a 7 flat blade.

Can't I just use remove the wires from the old plug and place them into a new 7 blade plug? In the pics posted, the wires are set into terminals with set screws. Am I correct?

smkettner wrote:
I would put a new plug on with the flat blade connectors.
No adapters unless you are just towing it someplace to sell.

X2

Just more connections to corrode/cause resistance......doesn't take much to stop 12V DC

And for $3 more you can get a new trailer cord or for just $6 put a new 7 blade plug on trailer cord

Fewer connections......better connection

And trailer is now up to date for towing by your truck, your friends truck, neighbors truck, my truck :B

I would put a new plug on with the flat blade connectors.
No adapters unless you are just towing it someplace to sell.

Baja Man wrote:
Thanks for the replies.

What are the thoughts on using an adapter that goes from 7 pin round to 7 pin flat? Like this one....

7 round to 7 flat adapter

Seems like the easiest solution and not priced too bad. I would try it.

RustyJC wrote:
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

My bad I thought the trailer had the flat and truck round. I never owned a trailer that did not have the flat blade's.

Thanks for the replies.

What are the thoughts on using an adapter that goes from 7 pin round to 7 pin flat? Like this one....

7 round to 7 flat adapter

Should be a pretty straight forward job. If you have a 12v tester it will help.

Old-Biscuit wrote:
Take pics of old wire connections BEFORE disconnecting wires........:B

Good advice!