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Old 08-07-2003, 12:30 AM   #1
bunot
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Default HELP! MSD rpm window switch wiring...



where does the yellow wire tap into the circuit?

i am assuming it taps into the wire between the microswitch and the toggle arming switch. i just need clarification since i already blew a fuse trying to use a shortcut.

jason
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Old 08-07-2003, 01:56 PM   #2
bunot
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bump...c'mon...someone must know this diagram.

jason
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Old 08-07-2003, 03:27 PM   #3
ride5000
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jason,

what is the purpose of the microswitch? is it only there to arm the circuit at a certain throttle position?

do the switches have any more than 2 terminals?

ken
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Old 08-07-2003, 04:12 PM   #4
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Quote:
Originally posted by ride5000
jason,

what is the purpose of the microswitch? is it only there to arm the circuit at a certain throttle position?

do the switches have any more than 2 terminals?

ken
the microswitch turns on nitrous at WOT.

the toggle arming switch only has 2 terminals. the 1 that came with the nitrous kit has 3, but the 3rd goes to gnd so that the toggle switch can light up, it was an optional terminal according to NOS instructions.

i decided to go with a 2 terminal toggle switch instead. the lighted toggle switch was kinda cheesy.

jason
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Old 08-07-2003, 04:26 PM   #5
ride5000
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could it be then that the "toggle switch ground" wire from the msd controller was designed to go to the ground of the lighted toggle switch so that it only illuminated when the window switch was "on?"

ken
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Old 08-07-2003, 04:36 PM   #6
ride5000
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oh 5h1t... i just realized what's going on!!! i had a look here and it all made sense.

the msd switch doesn't provide a switched 12vdc... it provides a switched GROUND circuit.

that means when the window is "closed" it grounds out the yellow wire.

so what you need to do is:

+12vdc -- arming toggle
arming toggle -- microswitch
microswtich -- nitrous relay
nitrous relay -- yellow wire of the MSD controller

this is definitely what's going on!

hth
ken
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Old 08-07-2003, 05:03 PM   #7
bunot
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are you sure about that?

it does make sense that the red wire inbetween the power relay and the microswitch is the gnd wire and the one i need to tap, since the other wire inbetween the microswitch and the toggle switch is a 12 volt source.

oh well, i'll have to try it. let you know in a few hours.

thanks

jason
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Old 08-07-2003, 05:18 PM   #8
ride5000
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jason, it's GOTTA be that way... here's some text from that PDF file:

Quote:
The RPM Window Switch has a circuit that activates a device by providing a ground path at a
desired rpm (Figure 1). The ground will be removed at a different rpm to deactivate the device. If
no rpm module is installed, the device will remain activated as long as the rpm is above the
activation amount.
i had the same b1tch of a time when i wired up my smartshift shift light module. then i RTFM and realized what the deal was..

ken
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