Hooking up the Haltech F5 and it says to connected it to the negative side of the trailing coil. (Figure that to be the black/white wire on the two prung harness). I installed it on the yellow blue tach signal since I assumed it was 12V square wave output?

Any ideas.

Thanks,
Ian

 

Would have to be a square wave, yes, but I don't know about the voltage. 12v sounds high for a signal voltage (5v is common for digital (square wave) signals), but I dunno...

Hailers might know, then he could one-up me

 

BTW, when you say black/white wire, you sure it's not black/yellow? Because if it is, that's your POSITIVE wire from the main relay...

 

hmmm. NOt sure. I would have to go out and look at the car. Its raining and tarped I thought it was black with a white strip but your probable right. And another thing your right about the tach being a 0 to 5 volt pulse. No good. I'm going to have to see if I can find the 0-12volt square pulse from the negative side of the coil.

I measured around but saw constant 12vdc only. But I gather the meter is to slow to respond to such a change.

Thanks for your help.

 

Yeah, a multimeter doesnt have a fast enough trigger rate. Plus a square wave is not a constant DC voltage.

I could drag the o'scope out to the car if I had my FC here at work, but I am driving my buddies FD, and he probably doesnt want me probing around his car..