Neutral Safety switch, what do these wires do?
#1
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Car: 1985 Pontiac TransAM
Engine: 400SBC 24x conversion
Transmission: T700r Stage2 Shiftkitted
Axle/Gears: 2.77 9 Bolt
Neutral Safety switch, what do these wires do?
Gi Guys,
I've got a 1985 TransAM I'm in the process of rebuilding and I'm trying to get the starter sorted and have some issues.
Mainly with the cutting of the harness to install an OBD2 SBC and 97LT1 gauges, I need to find what these wires need to be wired to...
Yellow is ignition start,
purple is to starter solenoid
Orange/black appears to be to constant 12V
Black/white i think is ground
Blue=???
light Green=???
I'm assuming one is for reverse lights, and maybe the other powers it, but i got no clue, anyone able to help?
I've got a 1985 TransAM I'm in the process of rebuilding and I'm trying to get the starter sorted and have some issues.
Mainly with the cutting of the harness to install an OBD2 SBC and 97LT1 gauges, I need to find what these wires need to be wired to...
Yellow is ignition start,
purple is to starter solenoid
Orange/black appears to be to constant 12V
Black/white i think is ground
Blue=???
light Green=???
I'm assuming one is for reverse lights, and maybe the other powers it, but i got no clue, anyone able to help?
#2
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Re: Neutral Safety switch, what do these wires do?
Hi Evil Stuie ,
The green and blue ones get connected together when in reverse to light the reverse lights .
The orange and black get connected together whenever in park or neutral , and are not connected in any gear . This lets the ECM know whether the car is in gear or not .
I will enclose two wiring diagrams I found relating to your question . In the first , all the way at the bottom of the drawing you'll see the ECM's connection to the neutral switch via the orange & black wires , and in the second drawing , about halfway down on the left side of the page you'll see the reverse light's blue & green wires connection to the neutral switch .
Good Luck !
The green and blue ones get connected together when in reverse to light the reverse lights .
The orange and black get connected together whenever in park or neutral , and are not connected in any gear . This lets the ECM know whether the car is in gear or not .
I will enclose two wiring diagrams I found relating to your question . In the first , all the way at the bottom of the drawing you'll see the ECM's connection to the neutral switch via the orange & black wires , and in the second drawing , about halfway down on the left side of the page you'll see the reverse light's blue & green wires connection to the neutral switch .
Good Luck !
Last edited by OrangeBird; 05-17-2016 at 09:38 AM.
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91birdbuild (08-18-2019)
#3
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Car: 1985 Pontiac TransAM
Engine: 400SBC 24x conversion
Transmission: T700r Stage2 Shiftkitted
Axle/Gears: 2.77 9 Bolt
Re: Neutral Safety switch, what do these wires do?
Perfect, thanks for that.
From the diagrams and what you've said, it looks like the blue is 12v constant to supply the light green lights with power when the switch is in reverse, and the black is grounded and the switch grounds the orange wire to it when in park/neutral. does that sound about right?
From the diagrams and what you've said, it looks like the blue is 12v constant to supply the light green lights with power when the switch is in reverse, and the black is grounded and the switch grounds the orange wire to it when in park/neutral. does that sound about right?
#4
Supreme Member
iTrader: (1)
Re: Neutral Safety switch, what do these wires do?
Perfect, thanks for that.
From the diagrams and what you've said, it looks like the blue is 12v constant to supply the light green lights with power when the switch is in reverse, and the black is grounded and the switch grounds the orange wire to it when in park/neutral. does that sound about right?
From the diagrams and what you've said, it looks like the blue is 12v constant to supply the light green lights with power when the switch is in reverse, and the black is grounded and the switch grounds the orange wire to it when in park/neutral. does that sound about right?
#5
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Car: 1985 Pontiac TransAM
Engine: 400SBC 24x conversion
Transmission: T700r Stage2 Shiftkitted
Axle/Gears: 2.77 9 Bolt
Re: Neutral Safety switch, what do these wires do?
Well that saves some headaches then.
Hopefully I haven't blown the switch putting 12volts into it from the orange wire, but I'll find that out tonight.
Thanks again for that, one more problem I can tick off the list.
Cheers.
Hopefully I haven't blown the switch putting 12volts into it from the orange wire, but I'll find that out tonight.
Thanks again for that, one more problem I can tick off the list.
Cheers.
#6
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Join Date: Feb 2009
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Car: 1985 Pontiac TransAM
Engine: 400SBC 24x conversion
Transmission: T700r Stage2 Shiftkitted
Axle/Gears: 2.77 9 Bolt
Re: Neutral Safety switch, what do these wires do?
Yep, all works great now.
It did take me some time though, but I found the blue wire with 12volts powers the relay/switch, so if you don't have that wired up first, the safety switch wont ground and let you crank.
Thanks guys, I feel like I'm finally starting to get more wins than losses with this build
It did take me some time though, but I found the blue wire with 12volts powers the relay/switch, so if you don't have that wired up first, the safety switch wont ground and let you crank.
Thanks guys, I feel like I'm finally starting to get more wins than losses with this build
#7
Re: Neutral Safety switch, what do these wires do?
Hi Evil Stuie ,
The green and blue ones get connected together when in reverse to light the reverse lights .
The orange and black get connected together whenever in park or neutral , and are not connected in any gear . This lets the ECM know whether the car is in gear or not .
I will enclose two wiring diagrams I found relating to your question . In the first , all the way at the bottom of the drawing you'll see the ECM's connection to the neutral switch via the orange & black wires , and in the second drawing , about halfway down on the left side of the page you'll see the reverse light's blue & green wires connection to the neutral switch .
Good Luck !
The green and blue ones get connected together when in reverse to light the reverse lights .
The orange and black get connected together whenever in park or neutral , and are not connected in any gear . This lets the ECM know whether the car is in gear or not .
I will enclose two wiring diagrams I found relating to your question . In the first , all the way at the bottom of the drawing you'll see the ECM's connection to the neutral switch via the orange & black wires , and in the second drawing , about halfway down on the left side of the page you'll see the reverse light's blue & green wires connection to the neutral switch .
Good Luck !
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#8
Re: Neutral Safety switch, what do these wires do?
Hi Evil Stuie ,
The green and blue ones get connected together when in reverse to light the reverse lights .
The orange and black get connected together whenever in park or neutral , and are not connected in any gear . This lets the ECM know whether the car is in gear or not .
I will enclose two wiring diagrams I found relating to your question . In the first , all the way at the bottom of the drawing you'll see the ECM's connection to the neutral switch via the orange & black wires , and in the second drawing , about halfway down on the left side of the page you'll see the reverse light's blue & green wires connection to the neutral switch .
Good Luck !
The green and blue ones get connected together when in reverse to light the reverse lights .
The orange and black get connected together whenever in park or neutral , and are not connected in any gear . This lets the ECM know whether the car is in gear or not .
I will enclose two wiring diagrams I found relating to your question . In the first , all the way at the bottom of the drawing you'll see the ECM's connection to the neutral switch via the orange & black wires , and in the second drawing , about halfway down on the left side of the page you'll see the reverse light's blue & green wires connection to the neutral switch .
Good Luck !
#9
Re: Neutral Safety switch, what do these wires do?
Gi Guys,
I've got a 1985 TransAM I'm in the process of rebuilding and I'm trying to get the starter sorted and have some issues.
Mainly with the cutting of the harness to install an OBD2 SBC and 97LT1 gauges, I need to find what these wires need to be wired to...
Yellow is ignition start,
purple is to starter solenoid
Orange/black appears to be to constant 12V
Black/white i think is ground
Blue=???
light Green=???
I'm assuming one is for reverse lights, and maybe the other powers it, but i got no clue, anyone able to help?
Attachment 319904
I've got a 1985 TransAM I'm in the process of rebuilding and I'm trying to get the starter sorted and have some issues.
Mainly with the cutting of the harness to install an OBD2 SBC and 97LT1 gauges, I need to find what these wires need to be wired to...
Yellow is ignition start,
purple is to starter solenoid
Orange/black appears to be to constant 12V
Black/white i think is ground
Blue=???
light Green=???
I'm assuming one is for reverse lights, and maybe the other powers it, but i got no clue, anyone able to help?
Attachment 319904
#10
Senior Member
Thread Starter
Join Date: Feb 2009
Location: Brisbane, Australia
Posts: 848
Likes: 0
Received 14 Likes
on
12 Posts
Car: 1985 Pontiac TransAM
Engine: 400SBC 24x conversion
Transmission: T700r Stage2 Shiftkitted
Axle/Gears: 2.77 9 Bolt
Re: Neutral Safety switch, what do these wires do?
Mine had a B&M megashifter installed when I got it, so the wires on the left are coming from the relay box that was hooked up to that.
Looking at my plug it looks like it would fit the thing in your picture.
It's not as complicated as it looks once you understand what it's doing.
Basically the wires are just grounds and power.
Ground is the black/white wire
Purple & Yellow Neutral / Park is a powered 12v wire from the ignition, the purple goes to the starter. So as long as the gear is in P or N, the circuit is completed and when you turn the ignition the power goes to the starter.
There's a constant 12v wire (orange I think)
Green and Blue are your reversing lights, one of them is powered the other goes to the reverse lights so when the gear is in reverse it completes the circuit
Looking at my plug it looks like it would fit the thing in your picture.
It's not as complicated as it looks once you understand what it's doing.
Basically the wires are just grounds and power.
Ground is the black/white wire
Purple & Yellow Neutral / Park is a powered 12v wire from the ignition, the purple goes to the starter. So as long as the gear is in P or N, the circuit is completed and when you turn the ignition the power goes to the starter.
There's a constant 12v wire (orange I think)
Green and Blue are your reversing lights, one of them is powered the other goes to the reverse lights so when the gear is in reverse it completes the circuit
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Chase Ventler (07-25-2020)
#11
Re: Neutral Safety switch, what do these wires do?
Hi Evil Stuie ,
The green and blue ones get connected together when in reverse to light the reverse lights .
The orange and black get connected together whenever in park or neutral , and are not connected in any gear . This lets the ECM know whether the car is in gear or not .
I will enclose two wiring diagrams I found relating to your question . In the first , all the way at the bottom of the drawing you'll see the ECM's connection to the neutral switch via the orange & black wires , and in the second drawing , about halfway down on the left side of the page you'll see the reverse light's blue & green wires connection to the neutral switch .
Good Luck !
The green and blue ones get connected together when in reverse to light the reverse lights .
The orange and black get connected together whenever in park or neutral , and are not connected in any gear . This lets the ECM know whether the car is in gear or not .
I will enclose two wiring diagrams I found relating to your question . In the first , all the way at the bottom of the drawing you'll see the ECM's connection to the neutral switch via the orange & black wires , and in the second drawing , about halfway down on the left side of the page you'll see the reverse light's blue & green wires connection to the neutral switch .
Good Luck !
#12
Sponsor
Re: Neutral Safety switch, what do these wires do?
Neutral safety switch isn't affected by the ECM, it's controlled by the shifter. If the car is in park it lets power go to the starter and the car starts. As long as you still have the stock shifter you should be able to get the neutral safety switch to function, they are cheap and easy to replace if the current one isn't working.
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T.L. (10-14-2022)
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