Does MSD Window Switch send 12v or ground signal?
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Does MSD Window Switch send 12v or ground signal? Im having trouble troubleshooting my nitrous wiring and was curious if the MSD window switch send a 12v signal or a ground signal. Im using a diagram from the wiring sticky and eveything worked fine before I added a FPSS and cleaned up some of the wiring, now when I have eveything hooked up there are 2 ground signals are sent to my silonoids keeping them wide open, which floods my car......Please Help
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K. The yellow wire would have to be a Ground. If your noid is staying open you probably shorted one of the wires on the FPSS to ground.
1. disconnect the 12v on the noids. Tape it so it doesn't short on anything.
2. Check 12v at the WOT switch. On/Off with the switch? yes... continue
3. Next, ground pin 85 on relay. Flip switch on/off. Relay work ok? (either listen to it or hook a 12v light on the disconnected noid wire) continue.
4. Check MSD by disconnecting yellow wire. Connect yellow wire to 12v light ON THE GROUND SIDE OF LIGHT. Rev car to activate.
5. If all that works, then just look at your wires. Somewhere you've shorted something. You can also read through my wiring post in the "nitrous basics" sticky. There's some good trouble-shooting stuff there.
If you still can't figure it out, pm me when you at the car and I'll send you my phone number to talk you through it.
good luck
1. disconnect the 12v on the noids. Tape it so it doesn't short on anything.
2. Check 12v at the WOT switch. On/Off with the switch? yes... continue
3. Next, ground pin 85 on relay. Flip switch on/off. Relay work ok? (either listen to it or hook a 12v light on the disconnected noid wire) continue.
4. Check MSD by disconnecting yellow wire. Connect yellow wire to 12v light ON THE GROUND SIDE OF LIGHT. Rev car to activate.
5. If all that works, then just look at your wires. Somewhere you've shorted something. You can also read through my wiring post in the "nitrous basics" sticky. There's some good trouble-shooting stuff there.
If you still can't figure it out, pm me when you at the car and I'll send you my phone number to talk you through it.
good luck
Thread Starter
TECH Resident
iTrader: (22)
Joined: Oct 2006
Posts: 910
Likes: 0
From: Shreveport, Louisiana
K. The yellow wire would have to be a Ground. If your noid is staying open you probably shorted one of the wires on the FPSS to ground.
1. disconnect the 12v on the noids. Tape it so it doesn't short on anything.
2. Check 12v at the WOT switch. On/Off with the switch? yes... continue
3. Next, ground pin 85 on relay. Flip switch on/off. Relay work ok? (either listen to it or hook a 12v light on the disconnected noid wire) continue.
4. Check MSD by disconnecting yellow wire. Connect yellow wire to 12v light ON THE GROUND SIDE OF LIGHT. Rev car to activate.
5. If all that works, then just look at your wires. Somewhere you've shorted something. You can also read through my wiring post in the "nitrous basics" sticky. There's some good trouble-shooting stuff there.
If you still can't figure it out, pm me when you at the car and I'll send you my phone number to talk you through it.
good luck
1. disconnect the 12v on the noids. Tape it so it doesn't short on anything.
2. Check 12v at the WOT switch. On/Off with the switch? yes... continue
3. Next, ground pin 85 on relay. Flip switch on/off. Relay work ok? (either listen to it or hook a 12v light on the disconnected noid wire) continue.
4. Check MSD by disconnecting yellow wire. Connect yellow wire to 12v light ON THE GROUND SIDE OF LIGHT. Rev car to activate.
5. If all that works, then just look at your wires. Somewhere you've shorted something. You can also read through my wiring post in the "nitrous basics" sticky. There's some good trouble-shooting stuff there.
If you still can't figure it out, pm me when you at the car and I'll send you my phone number to talk you through it.
good luck
