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Old 10-07-2006, 10:36 PM
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T roadster neutral start switch?

Hi all,
I'm at the point on my roadster wiring I need a park/neutral safety start switch.It's runnung a 67 power glide and home built shifter.Any ideas for a switch from NAPA,Checker,Big A ?
Thanks,Doug.

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Old 10-07-2006, 11:15 PM
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Doc here,

Well, the first thing to do is fabricate a switch mount..you say the linkage is homebuilt? How?

It's really hard to comment without a pic and particulars..But if it were me, and the transmission link are receiver was stock, (half rounded) I'd make a mount to support a normally closed push button switch..Then file or grind a "Notch " with a smooth surface up and down at the proper angle (so the switch arm slides in and out without catching) and do that for park and neutral.

Be sure the switch contact can handle the draw of the solenoid (or run a relay) and run the "S" wire from the ignition switch to it, and the other side to the solenoid..adjust it mechanically..should work fine..

In this configuration, it will only have contact in the "Detents" you ground, (park and neutral) but not while riding on the rest of the linkage arm..(contact open)...

You CAN get micro switches with an extending arm and a roller on the tip, to do this job, but you need relay control for the wiring as the contacts burn up at less than an amp.

Or another super simple way to do this, is use a magnetic interlock switch like the type used on hot tub electrical panels..or alarm system window or door mag switches..mounted close along side the linkage arm..and very slim magnets epoxied to the linkage arm..you'd have to experiment on how small (thin or wide ) the magnets need to be..so they wouldn't trip slightly before or after the park or neutral preset..

Either should work fine..just remember contact ratings for the solenoid Vs contact on the switch..

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Old 10-08-2006, 06:49 AM
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Minor point...but do you really need a switch at both the park and neutral positions? I'm thinking of fabbing a switch but figured I'd only install one...and that would be in park. Any drawbacks to that?
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Old 10-08-2006, 07:04 AM
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Early powerglides had a NSS attached to the tranny and operated with a short piece of linkage. I don't know if you can still get them.
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Old 10-08-2006, 07:40 AM
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Doc here,

Well you can pick one..but there are drawbacks..for instance if you go for Neutral, then park will no longer start..and it can roll away in neutral..should you forget the parking brake..while cranking..

You only need ONE switch, no matter how you configure it..and TWO detents..to activate the switch..

Assume you have a floor linkage with a single rod going back to a half round linkage arem (IIRC) , you put a notch in the park position for the switch button to fall into and another for the Neutral position..If you have a "Straight Arm"..you can add an extension arm to it to pass over the switch..

If you can find the NOS switch mount as mentioned AND it will work with your homebuilt linkage..that is a good way to go..

Doc
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Old 10-08-2006, 12:16 PM
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Lokar sells a neat little set up that I have used before ...



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Old 10-08-2006, 03:58 PM
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Doc here,

BINGO!!!! Thanks Deuce,

That is what I was trying to describe to "home build" with a second arm for neutral..

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Old 10-09-2006, 08:06 AM
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Thanks to everyone for your help.Is just the switch available from Lokar or Ron Francis? Mounting/tripping the switch is not a problem,just takes time.What I really need is a suitable switch.
Thanks again,Doug
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Old 10-09-2006, 05:34 PM
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Doc here,

That EXACT kit is available at auto zombie or Painless ..for 59.95..AND has Backup lamp options..

NSS Switch Bottom of the page...

Contact either..I'm sure they must carry the replacement switch If you don't opt for the whole kit..BUT for $60..the kit solves a bunch of problems you could be concentrating on elsewhere

Doc
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