Breakaway Switch Confusion.
I recently purchased a 2003 25' Coachman travel trailer. The breakaway switch was crushed on the trailer so I replaced it but I am confused about the power for it. The old one only had 2 black wires c...
Forum Discussion
opnspaces wrote:Gdetrailer wrote:
Heck even on my TT, I have added a relay so when the pin is pulled it automatically disconnects the brake wiring electrically from the vehicle. The vehicle brake controller will now give you a warning of no connection before you start driving..
Gdetrailer, maybe I just haven't had enough caffeine, but having trouble picturing the wiring of your relay.
I can see a normally closed relay where the the brake signal wire runs through from the tow vehicle. But what are you using for the power and ground on the trigger wire?
You could use a double throw relay. Connect the input of the switch to the trailer battery positive. Feed the relay coil with the output of the switch. Connect the vehicle brake line to NC. Connect battery positive to the NO pin. Connect the trailer brake line to the relay common. Finally, just ground the other side of the coil.
Normally the vehicle powers the brake through the cold relay. If you pull the pin, it activates the relay and sends power through the NO pin to the brakes while disconnecting from the vehicle brake wire.
