AOD Neutral Safety Switch Wiring

51504bat

51504bat

Well-known member
I'm installing a 302/AOD combo from a '83 van in my '54 Ranch Wagon. I have the factory plug from the van harness. I believe the NSS is just a pass through switch that when the trans is in neutral or park the power coming in from the ignition switch is passed onto to the starter solenoid. Both of the wires on the plug for the NSS are the same color - pink with black and there location jives with the diagram I've attached. The other 2 wires are for the back up lights. One is black and the other purple. One should be 12 volts coming in and the other 12 volts out when the trans is in neutral but I don't know which is incoming hot and which is out going hot to the lights. I can barely see the switch on the trans so I really can't get a test meter to it to sort things out. Can anyone tell me which wire should be hot coming in? or do I have this all wrong. If so please enlighten me. Thanks in advance.
 

Attachments

  • AOD neutral safety switch wiring.jpg
    AOD neutral safety switch wiring.jpg
    27.9 KB · Views: 21
I have the factory plug from the van harness.
Click to expand...

You would need a WIRING SCHEMATIC from the donor vehicle to cipher the color codes. If you look closely at the connector itself, you can un-pin the connectors from the plug and re-pin (with new pins available from most any auto parts store) your wires back into the connector. This way you won't have to make splices.

Your application only requires the correct wire(s) placements for ON/OFF.

Does this make sense?
 

Attachments

  • AOD SWAP - NSS Connector _2.jpg
    AOD SWAP - NSS Connector _2.jpg
    21 KB · Views: 28
Rewiring the entire car so it will need splices somewhere. I'll try and locate a factory wiring diagram for an '83 E150 van. I'm assuming that the in and out wires for the NSS doesn't matter as to which pin is in and which pin is out but I'm guessing that it does for the back up lights.
 
JSeery said:
Does this one help? If not I have Fox body mustang detailed wiring diagrams I can check.

https://www.fordmuscleforums.com/threads/backup-light-and-neutral-start-wiring-88-aod.502291/
Click to expand...


From the link:
I've checked both Mitchell and Alldata, both list the wire colors for 88 town car the same,

@ neutral safety switch...

Start in; white\pink
Start out ; red\light blue


This is the info I'm looking for since I have the factory plug. Unfortunately my colors are different. I'll see if the shop that a buddy used to work for can look it up on Alldata for me.
 
... hold on a minute ...

This is becoming far too complicated.

You have the connector and leads cut from the donor wire harness, correct? The PIN OUT is shown in the ILL you posted. You would splice your wire harness lead to one pin (in) and the other pin (out) would be to complete whichever circuit (NSS - BU LAMP). It (NSS) is simply an on/off switch in this swap.
 
An on off switch really doesn't need to identify for in or out. There is no polarity issue and no cross wiring issue between the two sides of the dual switch as long as you can identify which side is which.

It would be interesting to know how this switch functions though. If it is a spring loaded push type switch or if it is a rotary switch. Most are rotary types so that both park and neutral will function the start circuit (two positions). The reverse light part of it only operates in one position. With only 4-pins, I would figure it to be a rotary type switch unless a push type has multiple internal switch connections.
 
KULTULZ said:
... hold on a minute ...
This is becoming far too complicated.
...
Click to expand...

rotorwrench said:
An on off switch really doesn't need to identify for in or out. There is no polarity issue and no cross wiring issue between the two sides of the dual switch as long as you can identify which side is which.
...
Click to expand...
Times 2, or is it 3?
The NSS and backup light switches are electrically independent from each other, they just happen to be in the same housing.
It's only a couple on/off switches, don't overthink it. Just ID which connector pins are for each side (NSS or Backup) and connect the wires for each one.
 
OK. I know which 2 pins are for the NSS and which 2 are for the back up lights. What I don't know which is in and which is out for each. My guess is that it doesn't matter for the NSS switch since its a pass through switch and both wires on the factory plug are the same color. But the back up light wires are 2 difficult colors. Most switches work regardless if which side is in and which side is out but not sure on this since the switch is inside the trans. Still trying to track down a factory wiring diagram for a 1983 E150 van to verify which color wire goes to which pin.
 
I finally found a diagram which shows which pin is in and which is out. The colors listed aren't the same as my pigtail but the important part is which pin is which. Thanks for all the help.
 

Attachments

  • AOD Transmission Connector.jpg
    AOD Transmission Connector.jpg
    25 KB · Views: 16
All hooked up although temporarily until the entire rewire gets done. Reverse lights come on in reverse and only cranks in neutral and park. PITA to get the plug onto the switch, not much clearance for your hand. The pigtail from the donor vehicle is frayed. I either need to replace the contacts/wires or get a new socket. Ron Francis lists one for 30 bucks and change plus shipping. Might be the way to go when when I completely rewire the wagon. Thanks again for all the replies.
 
You must log in or register to reply here.
Back
Top