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Window switch

Decided to go with this unit, Digital RPM Window Switch - 8969 seems to be the easiest to connect to the Zex NMU, any thought or experiences. Thanks, I know

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Old 11-15-2014, 06:53 PM   #1 (permalink)
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Decided to go with this unit, Digital RPM Window Switch - 8969 seems to be the easiest to connect to the Zex NMU, any thought or experiences. Thanks, I know I've been hitting the forums hard with my dilemma and I really appreciate the help.
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Old 11-15-2014, 07:47 PM   #2 (permalink)
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Quote:
Originally Posted by tommyguns View Post
Decided to go with this unit, Digital RPM Window Switch - 8969 seems to be the easiest to connect to the Zex NMU, any thought or experiences. Thanks, I know I've been hitting the forums hard with my dilemma and I really appreciate the help.
There is a fuel saftey pressure switch in the diagram but should help.

*Edit* wrong wiring diagram*

Last edited by madwi; 11-15-2014 at 07:58 PM.
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Old 11-15-2014, 07:50 PM   #3 (permalink)
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Originally Posted by madwi View Post
There is a fuel saftey pressure switch in the diagram but should help.

The diagram for the 8969 shows no need for a relay, I have no clue how to screen capture
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Old 11-15-2014, 07:56 PM   #4 (permalink)
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my bad, I grabbed the wrong pic...
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Old 11-15-2014, 08:00 PM   #5 (permalink)
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It's been a long day, I will try to find the correct one.
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Old 11-15-2014, 08:03 PM   #6 (permalink)
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msd install pdf page 4
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Old 11-15-2014, 08:10 PM   #7 (permalink)
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msd install pdf page 4
even better
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Old 11-15-2014, 08:13 PM   #8 (permalink)
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So what do you think, no relay and looks like the yellow goes to the white on the NMU?
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Old 11-15-2014, 08:44 PM   #9 (permalink)
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It looks like relay pins 85 and 86 are the coil. This would mean that the yellow wire on the window switch unit goes to ground (energizing the relay) when the WS unit is powered up via the red wire.

Appears that relay pin 30 is the switch common with pin 87 being the NO contact and 87a the NC contact. This would kill the TPS signal to the ZEX if fuel pressure is too low.

If I got all that right, the white wire on the ZEX should be connected to TPS. Doing so will do away with the low fuel pressure cut-out.
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Old 11-15-2014, 08:47 PM   #10 (permalink)
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Originally Posted by SouthArk370Z View Post
It looks like relay pins 85 and 86 are the coil. This would mean that the yellow wire on the window switch unit goes to ground (energizing the relay) when the WS unit is powered up via the red wire.

Appears that relay pin 30 is the switch common with pin 87 being the NC contact and 87a the NO contact. This would kill the TPS signal to the ZEX if fuel pressure is too low.

If I got all that right, the white wire on the ZEX should be connected to TPS. Doing so will do away with the low fuel pressure cut-out.
Thanks for the reply. But the one diagram pictured is not for the unit I'm looking at. If it's not to much trouble, could you look at the pdf install for the 8969 digital unit. I could really use the help, this sh!t is driving me crazy.
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Old 11-15-2014, 08:59 PM   #11 (permalink)
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If this would work I would even go this route Edelbrock Nitrous Systems
Digital RPM Window Switch
Catalog #71905
but in the wiring diagram it shows the white wire from the relay going to a micro switch, should I assume that in stead of going to a switch it goes to the NMU white wire?
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Old 11-16-2014, 06:07 AM   #12 (permalink)
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Post links to schematics and I'll see what I can figure out.
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Old 11-16-2014, 11:22 AM   #13 (permalink)
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Thanks for helping, here's two I'm looking at http://www.jegs.com/InstallationInst.../350-71905.pdf
http://www.jegs.com/InstallationInst...1/121-8969.pdf
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Old 11-16-2014, 11:49 AM   #14 (permalink)
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White - Engine RPM input signal. 5-12V pulse. You can use the negative side of one of the coils or the signal from the ECM. See FSM for pinouts.
Red - RPM switch power. Get power from one of the fuse panels and use an on/off switch between the fuse block and the RPM switch. Mount the on/off switch anywhere that is convenient.
Yellow - RPM switch output (NO). Drive a relay with the output and use the relay NO contacts to switch the load (nitrous valve). Run one side of the relay contacts (NO) to the nitrous valve and the other side of the contacts (common) to a fuse and then a power source.
Gray - RPM switch output (NC). Not needed.
Black - RPM switch ground. Run to closest convenient ground.

The micro-switch (NO) is a WOT indicator to enable the relay.
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Last edited by SouthArk370Z; 11-16-2014 at 11:54 AM.
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Old 11-16-2014, 12:02 PM   #15 (permalink)
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Quote:
Originally Posted by SouthArk370Z View Post
White - Engine RPM input signal. 5-12V pulse. You can use the negative side of one of the coils or the signal from the ECM. See FSM for pinouts.
Red - RPM switch power. Get power from one of the fuse panels and use an on/off switch between the fuse block and the RPM switch. Mount the on/off switch anywhere that is convenient.
Yellow - RPM switch output (NO). Drive a relay with the output and use the relay NO contacts to switch the load (nitrous valve). Run one side of the relay contacts (NO) to the nitrous valve and the other side of the contacts (common) to a fuse and then a power source.
Gray - RPM switch output (NC). Not needed.
Black - RPM switch ground. Run to closest convenient ground.

The micro-switch (NO) is a WOT indicator to enable the relay.
Holy cow my head is spinning lol. I'm sorry please forgive me for my ignorance when it comes to wiring. So how do I incorporate the Zex NMU? This is for the Edelbrok unit correct?
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