7way round pin to RV flat

Hello all! Bought a 2013 cascadia to pull a large horse trailer. Have to add a RV 7 blade socket. Signal Lights are not a problem but was wondering if I can use the antilock brake power as the 12 volt power to horse trailer. I believe this only recharges break away battery and accessory battery on trailer. Trailer has shore power when set up. Also this truck has an additional pigtail just for abs that has a add on - on /off switch on dash. Just wondering why when it's included in main pigtail? Also I have to add a pressure switch to service air brake system to activate electric brake controller. Any suggestions on a good location? Thanks

 

You can't add a pressure switch, you need an air to electric brake converter.

Read this ...https://www.etrailer.com/question-45209.html

Don't try to add a socket or change it just get this ..

https://www.etrailer.com/Wiring/Pollak/PK12-724.html

 

I read up on the converter plug. But it doesn't contain an electric brake circus not does it combine brake and turn signals. The semi trailers have separate brake and turn signals as well as the clearance and marker lights. So this won't work unfortunately. Local Freightliner mechanic told me not a good idea to splice into truck harness as it causes issues. Same with the brake light switch. The electric brake controller requires a 30 amp supply and a trigger 12 volt from a brake light switch. So by using a air normally open pressure switch I can supply the trigger circut.

 

I put a female trailer socket on my cat walk next to the pogo-stick to plug in my trailer cord. Ran a new 7 wire cord to the rv 7 pin to the rear next to my bumper pull hitch that way it is not wired directly into the truck and it is dead when not connected. Wired black wire only for trailer lights. I used blue wire for the acc battery power to trailer.
I wired in a Tekonsha controller that will even work seperately with the Johnson bar.

 

To clarify. The Tekonsha controller also works normally with the foot pedal too. Just wired it to the brake light switches to work just like in a pickup truck.

 

Nice set up! What year is your truck? I know there is a brake light switch on this truck but the Freightliner dealer said not to tap into it for some reason. Something about the Sam modules. Ugh, think I should have bought an older truck! The blue wire on your truck is for the abs? And you used for RV power?

 

It’s a ‘67. Yes. I wired the blue straight to the 12v power source on starter lug for main battery cables with an inline Buss type 30 amp circuit breaker to allow me to hook abs trailers and so I can use it to charge battery on trailers through it. Had to add that because they do not exist on the pre-abs trucks. Some guys add an extra toggle on the dash to kill power through it when not needed or to turn on to keep the abs light off on newer trailers. The original wires to brake light switches were 14 gauge so I changed them to 12 ga. Overkill. With led brake lights they arn’t drawing enough amps to hurt the switches. Look at the small ga wires they run on the brake light switches on the pickups with all the factory tow package so that tells me amp draw isn’t all that much. And besides you technically got 3 wires controlling the brake lights 2 through the turn signal switch to both turns and the single dedicated red wire for the “fail safe”.

 

You look @ this. Pricey, but we'll made. JACKALOPEE | Szmyt ET Products

 

You look @ this. Pricey, but we'll made. JACKALOPEE | Szmyt ET Products

 

I have an 04 387 Peterbilt that I have for recreational use. Retirement toy. I used the commercial harness and wired a round female recreational 7 connector to the Pete. The plug-in also has the four/five flat adapter, so I can pull any trailer I want. I have one trailer with electric brakes, so I plumbed in an online switch for the brake controller. I do not like electrical issues, but I did get this working and it's very well...so far