Quote:
Originally Posted by Chris_SVS
The bypass relay needs one  |
Yep, just fitted one on my new (to me) Yaris.
The bypass relay takes voltage signals from the various lamp circuits to energise relays for the trailer power. No significant extra load put on the car lamp circuits, power comes down a dedicated line.
It needs a permanent supply because some safety features need to work with ignition off, so power must be supplied to the relay power contacts permanently.
As usual the biggest headache is sorting out how to tap into the signal wires without using those spawn of the devil scotchlok things. Managed to sort out some thin pin terminals which will push into the back of the lamp cluster socket, job done (eventually).