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66 neutral safety switch

1963JAM

1963JAM

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Troubleshooting neutral safety switch. Seems simple enough, check with multimeter brown wire at starter relay to ground and get no tone. Inspect and trace wire from starter relay connector to neutral switch connector, meters out fine. Can't find any auto parts stores that sell this single post switch. Looked through FBBO previous posts about this switch, but no mention about who sells a good replacement part.
20211128_175931.jpg
 
It has ground in park and neutral only. You may need a helper moving the shifter if it is out of adjustment.

and if it has a 69 and newer valve body that switch doesn’t work very good on them.
 
If you have a floor shifter make sure it's adjusted properly.
Another pretty easy way to ensure it's the switch is disconnect the linkage right at the shift lever and move the lever manually.
 
I'm pretty sure A&A TRANS in Indiana still has them.... and
John Cope may too. Both good places to ASK anyway. ALSO, rare issue, but did you check the comb inside the trans to make sure there's no problem there??
 
Don Frelier said:
If you have a floor shifter make sure it's adjusted properly.
Another pretty easy way to ensure it's the switch is disconnect the linkage right at the shift lever and move the lever manually.
Click to expand...
I will try that. Car has console shifter, and I did try wiggling shifter handle. But I will check lever action at the trans lever adjuster.
 
Lefty71 said:
I'm pretty sure A&A TRANS in Indiana still has them.... and
John Cope may too. Both good places to ASK anyway. ALSO, rare issue, but did you check the comb inside the trans to make sure there's no problem there??
Click to expand...
I’ll have to look into that as well if linkage adjust won’t make solid switch action. Thank you
 
I think tractors run a switch similar for 4wd and pto applications! if your having trouble locating right switch maybe take it too a jd dealer! if they have a match from deere it won't be cheaper!
 
Was your switch working and quit or have you made some changes?
 
Have you manually applied a ground to your starter relay ground post to make sure its working properly?
 
Shorthorse said:
Have you manually applied a ground to your starter relay ground post to make sure its working properly?
Click to expand...
Very carefully I might add, like with the back wheels off the ground
 
Don Frelier said:
If you have a floor shifter make sure it's adjusted properly.
Another pretty easy way to ensure it's the switch is disconnect the linkage right at the shift lever and move the lever manually.
Click to expand...
Excellent tip. You got me thinking while waiting for a new switch. I put a multimeter on resistance tone on the switch connector and tried to adjust shifter rod at the tranny lever, and got the intermittent tone wiggling the linkage. Then noticed the shift rod is rubbing the transmission cooler line. Now do I still have a bad switch, or is the switch barely making contact on the lever inside the tranny. I have to drop the pan to replace leaking gasket anyway, so I'll get a better look at what's going on inside.
So again thanks for the tip, it got me digging.
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