I'm trying to connect a shift light to my car that runs the Rover VVC engine, ECU 2 I believe (1999).
I did previously connect the shift light to the wires going into the back of my tacho, Live, Earth and Signal.
I found that I had problems with the signal wire not having the oomph to share it's signal with the tacho and the shift light. Due to this, my tacho didn't read correctly while using it in conjunction with the shift light.
A quick email to the manufactures of the shift light suggested that I connected the signal wire to the coil where the signal strength would be stronger.
This is where I'm stuck.
Having a look at the coil today, I have two plugs going to it, one with three wires and the other with 2 wires.
Plug one: Pin 1 Brown & Pink
Pin 2 Brown & Pink
Pin 3 Grey & White
Plug two: Pin 1 Brown & Pink
Pin 2 N/A
Pin 3 Grey & White
Which wire to I have to tee the signal into? It's been suggested that it's normally an outside pin and it's also the negative, but I don't have a multimeter with me today. I was wondering if anyone else has had to do similar and could tell me what wire they have tee'd into.