[jeopardy98]

Which wire is the coil output signal?

I finally ordered up that raptor tach wire with the resistor and I was originally using the wire from the factory gauges (2nd gen) that powered the tach. Well now that wire doesn't produce enough voltage because of the resistor for the gauges (vapor) to get a signal.

I'm looking for the coil wire so that I can go directly to that instead of wrapping around the spark plug. I'm looking at the wiring diagram but I can't figure out which one it is.

I have 4 choices according to the diagram

B/O
B
O/W
W/Bl

The B/O and the O/W go to the starter button so I'm thinking they are inputs. Both other wires go to the ECM so I can't figure out how I'm supposed to get a signal unless one of the ones going to the ECM is an output. Any help is appreciated.

Also, this O/W goes into top right corner coming from the ignition coil but I don't know what the end is supposed to go to since it isn't labeled??

 

[FatCat]

What is a "Raptor tach wire"? I am assuming it's an aftermarket tach or shift light?

The factory Tach reads from the front coil negative (B/Y). You are not going to find a hotter signal than that.

If that does not work then you will need to remove the resistor.

If you can post up some more info, we can figure it out.

 

[jeopardy98]

Hey, thanks for the info. I ended up using the rear coil negative which is black and it works like a charm A little more time with the multimeter and the wiring diagram was all it took. Oh and a little help from Nexus (thanks). No more erratic tach

 

[erstadw]

can you tell me where the coil is located on the 2nd gen sv? I need to find it also to hook up my raptor shift light.

 

[jeopardy98]

It is pretty easy to find. Just take the rear spark plug cap and follow it backwards. I believe the rear coil was just inside the frame and it has two wires coming off of it. The solid black one is the one that you need. I'm going from memory but I think the other one is black with a white tracer. Don't use that one.