Neutral Safety switch

Bobbo21

Not-quite-so-new-guy
May 28, 2023
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I have a 79 Cutlass Calais. My question is car doesn’t have neutral safety switch I’m running aftermarket shifter I have reverse lights figured out but two purple wires I need help with. What ways to wire this??
 
Most aftermarket shifters have provisions for a neutral safety switch. Check Summit.
 
Those purple wires would go into the 12Ga Purple wire from the ignition switch to the starter. Ignition switch to neutral safety switch, other wire from the neutral safety switch out to wire to the starter.

If I was dong it I would use a relay but it is not mandatory. Just a lot of current running around inside the car when you are cranking.
 
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Those purple wires would go into the 12Ga Purple wire from the ignition switch to the starter. Ignition switch to neutral safety switch, other wire from the neutral safety switch out to wire to the starter.

If I was dong it I would use a relay but it is not mandatory. Just a lot of current running around inside the car when you are

Those purple wires would go into the 12Ga Purple wire from the ignition switch to the starter. Ignition switch to neutral safety switch, other wire from the neutral safety switch out to wire to the starter.

If I was dong it I would use a relay but it is not mandatory. Just a lot of current running around inside the car when you are cranking.
So I was going run a purple wire from the shifter to the starter than purple wire from starter to the shifter. But I would need relay diagram
 
Using a relay depin the purple wire from the ignition switch and put it on pin 30 of the relay socket. Make a new 12Ga wire with two female connectors, one end into the ignition switch connector where the purple wire came from and the other end goes on 87 on the relay socket.

Get power from somewhere connect to pin 86 on the relay socket, ground one of the neutral safety switch purple wires and connect the other one to pin 85 on the relay socket.

The neutral safety switch grounds the relay energizing the coil and turning the power on to the starter.
 
Using a relay depin the purple wire from the ignition switch and put it on pin 30 of the relay socket. Make a new 12Ga wire with two female connectors, one end into the ignition switch connector where the purple wire came from and the other end goes on 87 on the relay socket.

Get power from somewhere connect to pin 86 on the relay socket, ground one of the neutral safety switch purple wires and connect the other one to pin 85 on the relay socket.

The neutral safety switch grounds the relay energizing the coil and turning the power on to the starter.
79 Cutlass does not have that purple wire from ignition. My car had some rod I was told
 
This is the purple wire I am referring to.
StarterSystem-700x1024.jpg
 
On top of what ELCAM posted for the wire diagram, the stock columns for automatics has a built in mechanical stop that would only allow the circuit to work if the shifter (column or floor via back drive linkage) to only open when the blocker allowed the electric ignition switch to be pushed by the rod from the ignition lock being turned. This is why in most cases it is best to keep that shifter/back drive linkage to work the column switches in the stock manor. For the aftermarket switch on the shifter it would be best to wire it like the way it is for the clutch pedal switch. Remember to keep that wire as a 12 gauge if it'll be as direct wire to switch with no relays. I do believe 3rd gen F bodies do have the neutral switch mounted the the automatic shifter simular to the aftermarket which could be used as a reference on wiring things up too.
 

Bobbo21 I HIGHLY...let me stress, HIGHLY recommend anyone with a A/G-body try to obtain mechanical/electrical literature that GM provided to dealerships if you approach your car with a wrench in your hand. I bought mine directly from Helm instead of waiting for ebay to come into existence, so I paid dearly. Anyway, this is not to knock Chitlin's or Haynes, or any of those other manuals, as they sometimes have very good info in them. But if I wanted a reference manual to go by, the GM chassis service manual (CSM) is the way to go. And for this price (~25 delivered), you're stupid not to get one if you plan on turning wrenches on your car. Obviously, it's only as good as the print date, but you'd be surprised as what it covers. And this one came with the wiring diagrams included.

You can even get the CD-ROM version of the manual, and comes with Fisher Body manual too, but the quality of those CD-ROMs usually leave much to be desired. But the good thing about those are, you can print pages as needed and not have to grease up the actual manual.
 

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