5 Pin Relay Wiring Diagram. A 5-pin relay can control two devices based on the switch position. When the light switch is off, the second device is on by default(NC position). When the relay is activated(the light switch is on), the second device turns off, and the first device turns on. See the wiring diagram of a 5-pin relay below in both.. 7 Way universal bypass relay wiring diagram. Feb 01 2011 Filed In: Wiring Diagrams.. Fitting this Universal Bypass Relay to your car between the wiring system and trailer plug socket bypasses all of the fault finding and diagnostic systems created by Can bus. This basically leaves you with a standard 12v power supply.
terminal. Insert the twisted wire core to the backstop inside the terminal block and release the button. 1. Locate the wiring to the rear lights of the vehicle (usually on one side of the vehicle) and select a suitable point at which to mount the By-pass relay and make the necessary relay and towing socket cable connections.. This relay isolates the 12v power supply and bypasses any fault finding or diagnostic systems after the relay. A fuse should be fitted to the relay's power supply so in the event of a fault or short circuit your car remains unaffected. Please be aware that no system on your car will alert you to faults with your trailer's lights while