Author Topic: Problem with new neutral safety switch  (Read 3047 times)

Offline shadango

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Problem with new neutral safety switch
« on: October 11, 2009 - 09:29:22 AM »
 :swear: :stomp:

So I bought a new neutral safety switch and tried to install.  Turns out the threads were bad.

Took it back and got a different one.

Tested it to make sure that it reads continuity at rest...and it does...

Screws in just fine.

Tested to see if it works in reverse (using an ohm meter) and IT DOESNT!!!!!! :banghead:

It works up til a point when I screw it all the way in....

I bought the switch for a 72 Barracuda.

Here is what it looks like....



All I can figure is that the switch is the wrong switch......maybe a diff between switches for the 904 and 727? Though it matches the (bad) switch that the tranny shop who rebuilt my tranny installed.....they could have put the wrong one in too...

HELP!!!! :pullinghair: :banghead: :dunno: :clueless:

On top of that, I just found that our water heater has a leak and is leaking all over the floor.

SO there goes MY day. :swear: :stomp: :pullinghair: :banghead: :pullinghair: :banghead: :swear: :stomp:
« Last Edit: October 11, 2009 - 09:43:07 AM by shadango »




Offline Bullitt-

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Re: Problem with new neutral safety switch
« Reply #1 on: October 11, 2009 - 09:45:55 AM »
I've read here that the thickness of the seal can effect correct function.. back the switch off 1/4-1/2 turn & see if it works, if so a thicker seal is needed... if not maybe the seal is too thick.
Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
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Offline wally426ci

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Re: Problem with new neutral safety switch
« Reply #2 on: October 11, 2009 - 09:46:51 AM »
I just grounded that tab on my starter relay. If you dont care about having "no back-up" lights.
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Offline shadango

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Re: Problem with new neutral safety switch
« Reply #3 on: October 11, 2009 - 10:03:14 AM »
Thanks guys

The seal seems to be a standard looking seal.

I could just leave the switch as-is and the car will start....

But I would like b.u. lights.

Offline Katfish

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Re: Problem with new neutral safety switch
« Reply #4 on: October 11, 2009 - 10:08:24 AM »
I have almost same problem, but my car wouldn't start.  So I had to add a jumper ground.  I know this is a bad idea, but it'll have to do till I can figure it out.

Surprisingly the car will start in gear, I guess the TQ is pretty loose.  Found this out by accident.   :dupe:

Post what you find, I need to fix mine.

Offline 422STROKER

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Re: Problem with new neutral safety switch
« Reply #5 on: October 11, 2009 - 10:09:22 AM »
Is the linkage adjusted properly?  I know when I first got mine up and running I had to jiggle the shifter for the reverse lights, I adjusted the linkages and now it's good.  I think I reused the NSS when I swapped from 904 to 727.

Tom :2thumbs:
Tom
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Offline Moparal

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Re: Problem with new neutral safety switch
« Reply #6 on: October 11, 2009 - 10:31:46 AM »
Has to be grounded. Checking that switch can fool alot of people.  It's the right switch.

Offline shadango

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Re: Problem with new neutral safety switch
« Reply #7 on: October 11, 2009 - 10:38:26 AM »
Has to be grounded. Checking that switch can fool alot of people.  It's the right switch.

I am confused.

Looking into the hole where the switch goes, there is the black plastic (whatever) part that moves when you move the selector.

From what I understand, there are two parts the switch....the center pin needsto be grounded on the metal contacts in park and nuetral for that part of the switch to work....

But it appears that the plastic part of the switch's plunger is what makes the b.u. lights work or not.....there is  detent on the "reverse" section of the tranny's slider that allows the switch to be at rest....thru the rest of the gears the switch would be depressed inaward.

That jives with my getting a continuity reading when the switch is at rest and the not when you depress the switch plastic part.....when you have continuity (switch at rest/plastic part not depressed) the connection is made and the lights would be on.  WHen depressed the connection is broken and the b.u lights go out.

My issue is that in reverse and the swictch screwed all the way in the switch's plastic part is being pushed in.....

Along the kines of what Bullit posted...if the switch idnt screw in as far it would function properly.....Or, the switch itself is too long where it goes into the tranny.

Now, Terry had told me that my tranny is a 78 from a pickup truck....could the switch be different on that year tranny?

Offline Bullitt-

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Re: Problem with new neutral safety switch
« Reply #8 on: October 11, 2009 - 11:18:51 AM »
Nope one switch....Just add a spacer/thicker seal
Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
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Offline shadango

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Re: Problem with new neutral safety switch
« Reply #9 on: October 11, 2009 - 12:21:20 PM »
Ok...but where will I find something that will work?

I was thinking maybe garden hose washers?

Offline Bullitt-

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Re: Problem with new neutral safety switch
« Reply #10 on: October 11, 2009 - 12:58:42 PM »
How about the old seal... Any extra gasket material you may have... garden hose is to large
Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
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Offline dodj

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Re: Problem with new neutral safety switch
« Reply #11 on: October 11, 2009 - 03:02:54 PM »
Maybe an 'O' ring?  :popcorn:
Scott
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Offline tactransman

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Re: Problem with new neutral safety switch
« Reply #12 on: October 11, 2009 - 09:33:18 PM »
Dave,try TWO gaskets on top of one another if it works not screwed in all the way.  :2thumbs:
Terry-tactransman 
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Union, Mo.
Give a man a fish and he eats for a day,teach him to fish and he eats for a lifetime.

Offline shadango

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Re: Problem with new neutral safety switch
« Reply #13 on: October 12, 2009 - 12:03:01 AM »
Well guys, that was the answer....used the old deal first and then the new seal...

Finally got done with the water heater install at around 7:30 (after three trips to the hardware store) had Subway for dinner with the family while the new tank heated up, took a shower (its amazing how we take hot water for granted...LOL)  then fell asleep watching "Becker" reruns...woke up at 11:30 and before I stumble off to bed I had to try it.  LOL

SO the day started out tinkering with the switch and ends with it.  :working:

Wondering how well it will seal though....should I use any sort of sealant on the threads and between the two seals?  The one old seal is very hard, like plastic....the new one has a rubbery feel to it...How about a teflon paste? What do you guys use?

I tightened up the switch to "just right" I think....not sure how much more I can go before it wouldn't work.....hoping not to have to mess with it once the tranny is back in....with the headers and such its a real PITA to get to it.

Thanks guys.   I dont know what people did before the web...this forum is awesome! It really helps to know people have gone through the same issues.  :thumbsup:




Offline tactransman

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Re: Problem with new neutral safety switch
« Reply #14 on: October 12, 2009 - 08:41:37 AM »
I have had to use two gaskets before,no leaks. :cheers:
Terry-tactransman 
Torqueflite/Automatic Transmission Specialist
Union, Mo.
Give a man a fish and he eats for a day,teach him to fish and he eats for a lifetime.