Rpm Signal

[screamin 99]

i can't get my window switch to pull rpm signal from my cam sensor wire (this is the brown wire with white tracer correct?) i have tried the low and high voltage wires on the switch with no luck. any suggestions?

[RadRacer]

Re: Rpm Signal

I used the wire coming from the ECU. Search, you'll find out which one to tap; don't worry about the wire color though, just make sure you get the right pin. IIRC, they said it's a white wire, but mine's blue, and one of my buddies had his as yellow, so just make sure you get the right pin and you'll be fine.

[Firebirdkid96]

Re: Rpm Signal

^ditto^

[ssms5411]

Re: Rpm Signal

I have no problems with mine off the cam sensor wire , it is one of the end wires on the harness, I think if your looking down at the 3 wires it is the one closest to you, so the left wire if you pull it out. Mine are so old I can't tell what the colors are. Make sure you have the MSD set on 1 and you should be good to go.

[ssms5411]

Re: Rpm Signal

The problems you have taking it off from the PCM is that if it pulls to much voltage, it shuts your car off. I found that out when I had a Raptor shift light wired up with the window switch and it would shut the car off, not good.LOL

[screamin 99]

Re: Rpm Signal

alright i have a new problem now. i was fighting with the pcm wire, tapped it, still didnt get a signal so i decided to switch to the lower voltage wire. i was getting in a hurry and forgot to disconnect the battery when i began to connect the other wire. now my car is dead to the world. i looked for some sort of blown fuse but couldn't find one. im afraid i fried my pcm what do you think???

[Firebirdkid96]

Re: Rpm Signal

I think you fried your pcm.

[screamin 99]

Re: Rpm Signal

well i let it sit for a while and hooked the battery back up then it came back to life. i went to hit the starter it went dead again. so, i rechecked the fuses and relays under the hood and i didnt plug the starter relay back in right. and i found the battery wasnt getting a good connection on the neg side. long story short the car is running and now im back to ground zero on getting a tach signal to my window switch. its not a msd btw its a summit window switch.(they are actually made by granatelli)

[RadRacer]

Re: Rpm Signal

did you try the low voltage wire yet? i'm pretty sure that's the right wire. which pin are you tapping?

[screamin 99]

Re: Rpm Signal

i actually dont think i tried that yet i might do that right now. as far as the pin. it is pin 54. it is a white wire and i hope im in the right bank. i pulled off the bottom one first to look at it. ther was nothing comming out of pin 54. so the next one came off and there was a white wire in pin 54. this was the top bank or the one towards the rear of the car is this right?

[RadRacer]

Re: Rpm Signal

sounds right to me. Give it a try and let us know.

[screamin 99]

Re: Rpm Signal

nothing still, what do i need to set the pulse setting to i have tried everything it seems. instructions say four stroke with distributer set pulse to half the # of cylinders. for single cylinder set to 0, and i have tried 0, 1, 2, 3, 6 what is up?

[RadRacer]

Re: Rpm Signal

what switch are you using? Our cars don't have a distributer, so usually you'd you use the dual coil setting. what settings are available?

[screamin 99]

Re: Rpm Signal

i have solved my problem. (it was a summit racing brand digital window switch, i found out it is made by granittli) i called summit tech line about 3 times they didnt know what to do so im sending it back and getting a zex window switch. i have a zex dry kit and the zex switch is pretty straight forward as far as hooking it up. no external relays and what not.

[RadRacer]

Re: Rpm Signal

alright man. good luck with the zex switch.