my 66 was a stick car when new, but i have a th400 now. can anyone tell me how where to find the neutral safety switch so i can hook it to my b&m shifter ? was it on the clutch pedal assy ? is it wired to my ign switch ?

Only auto trans cars had a safety switch in 66. Is one available from B&M that mounts on the shifter or linkage?

there is a switch on the b&m megashifter, but what do i wire it to ?

To wire it in, put the purple wire that goes to the "S" terminal on the solenoid on one terminal of the switch and run another wire back to the that terminal from the switch. Make sure you use the same guage wire.

To wire it in, put the purple wire that goes to the "S" terminal on the solenoid on one terminal of the switch and run another wire back to the that terminal from the switch. Make sure you use the same guage wire.


This is a bit confusing. What you want to do is cut the purple "S" wire on the engine side of the firewall and using the same gauge wire route the two
cut ends of the purple "S" wire to either side of your NSS.

Obviously you are going to have to lengthen the purple "S" wire to do this.

As I have pointed out many many times in the past ; you can find the "S" wire in the wiring harness that passes over your brake master cylinder. You have to dig it out of the harness but its there on every Chevelle ever built.

If you can find purple wire of the same gauge that'd be great but its not essential. Its the gauge thats important, not the color.

You SHOULD solder all of the connections of this little mod AND use "shrink wrap" on the solder joints. I say that as opposed to using "crimp" style connectors. Shrink wrap is far superior to electrical tape IMHO.


If you don't know what shrink wrap is go to your local auto parts store and inquire. They'll be happy to show you what they have and hopefully be able to explain how to use it.

Basically its a plastic tube that you slide onto the wire BEFORE you make the solder joint. After the solder joint is complete you slide the shrink wrap over the solder joint and then as you heat the shrink wrap It shrinks tightly around the solder joint. It seals out dirt, moisture and keeps the solder joint good for years. It also insulates the joint from shorting against any metal portion of the car. You can buy the stuff in various gauges for whatever gauge wire you are using.


Its my gut feeling that a cigarette lighter would be sufficient to heat the shrink wrap but I don't smoke so I have never tried a lighter :). Personally I have oxy/acetylene torches so I have abundant heat.