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#975149 - 04/17/11 06:15 PM 727 Neutral Safety Switch ?
justnuts40 Offline
member

Registered: 03/16/03
Posts: 155
Loc: Illinois USA
I have 727 trany. Im trying to get the NSS to work for the starter ground and the back up lights. Tell me if I'm wrong, but the two outside pins are the back up lights, 12 volts in and out, and the inside pin is the ground for the starter relay ground? I've checked the hot wire to the switch and have 12 volts. I've checked the center pin and have no ground out when in park, and nothing between the two outside pins in reverse. Bad switch?
Help1
Thanks for the post, Tony
etony58@gmail.com

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#975150 - 04/17/11 07:28 PM Re: 727 Neutral Safety Switch ? [Re: justnuts40]
screamindriver Offline


Registered: 02/14/04
Posts: 7083
Loc: Harrisburg, Pa.
You are correct...Center is NSS and two outside terminals are back-up..But you have it backwards at the other end of the switch...Plastic plunger operates the NSS and the pin activates the back-up lights..I'd make sure the shifter linkage is properly adjusted first thing...

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#975151 - 04/18/11 05:55 PM Re: 727 Neutral Safety Switch ? [Re: screamindriver]
dusturbd340W5 Offline
master

Registered: 01/19/03
Posts: 4614
Loc: Kissimmee Fl.
Quote:

You are correct...Center is NSS and two outside terminals are back-up..But you have it backwards at the other end of the switch...Plastic plunger operates the NSS and the pin activates the back-up lights..I'd make sure the shifter linkage is properly adjusted first thing...




sorry but this is incorrect the center metal pin on the inside is what grounds to the VB creating the ground that runs to the starter sol.
_________________________
70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.352 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4

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#975152 - 04/19/11 01:33 PM Re: 727 Neutral Safety Switch ? [Re: screamindriver]
John_Kunkel Offline
I Live Here

Registered: 01/20/03
Posts: 19227
Loc: Rio Linda, CA

The metal center pin serves both functions, it drops into a "divot" in the plastic shoe to activate the BU lights and in Neutral and Park it makes contact with the exposed metal base in the shoe to ground the starter relay.

The only reason the plastic plunger is spring-loaded is to keep it in contact with the plastic shoe.


Attachments
6592614-Switch_n_shoe.jpg (415 downloads)


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#975153 - 04/19/11 01:49 PM Re: 727 Neutral Safety Switch ? [Re: John_Kunkel]
TexasMopar Offline
member

Registered: 01/22/05
Posts: 84
Loc: Santa Fe,Texas
Thanks for the detailed operation of the switch and pic. Makes sense when you know the details. Jim

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#975154 - 04/19/11 02:31 PM Re: 727 Neutral Safety Switch ? [Re: TexasMopar]
RodStRace Offline
I Live Here

Registered: 09/21/05
Posts: 12384
Loc: Chino Valley
TECH ARCHIVE!!!

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