Originally Posted by DaveW
It's a simple relay rewire in the conventional way. I piggy backed off the original pressure switch initially, then switched the relay through the microswitch instead of through the original switch. It was a long time ago, but plenty of wiring diagrams on line.

I think Craig Jezz recently changed his plunger switch. That set up might be easier to fit.



Yes I had to replace mine, very easy to change, I’m not sure if my 4/4 set up would be the same as others though?. Mine has two switches, one Is the 1213C which I believe talks to the ECU, the other is a 1212C which operates the brake lights.

1212C (brake) when in rest position is open circuit
1213C when in rest position is closed circuit


I think that’s right ? HJF (Harry) on here is has all the experience and knowledge of how these switches operate. He helped me. Thanks Harry thumbs


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Last edited by Craig Jezz; 10/10/22 07:37 PM.
Craig Jezz