I'm installing a 'Painless' electrical re-wire on my 1970 Mustang that we recently bought. It seems to have a newer engine and possible transmission. I'm trying to connect the neutral safety switch but the four wires are not labeled. I have two red and two black from the switch. The ones from painless are labeled, my question is does it matter which connects to which or can I just do red to red and black to black? Thank you for any help.

 

You're in luck I just finished my wiring on my 66 coupe, you should have two connectors with two wires each, one set is for the ignition and the other is for the reverse lights. Black/red stripe is your reverse light. Red/blue stripe is ignition (park/neutral). Look at it this was, the circuit runs from the 2 wire plug, to the NSS, then back to the same plug over the second wire. The NSS completes the ignition circuit when in park/neutral, or completes the circuit to the backup lights when your in reverse. I wasn't able to pull up the 70 wiring but I believe the color code is the same. A way to test, short the male/female at the plug to complete the connection, leave the other plug alone.

 

Thanks for the response. In regards to the wires, my switch has two red and two black I have from the system the correctly colored wires, do u think it matters if I just pick one red wire from the switch and hook it up to one of the red wires from the Painless system and the other red to the other Painless red wire. I'm thinking since it is just a circuit I might be able to bypass while I wait to get a new switch. Thanks for the help

 

My suggestion, since red usually means power, and the NSS is fed and returned on the same color wire, I would short the two black wires to each other and turn your ignition switch on (when you're ready to test the system), and see if your back up lights come on. By process of elimination, that would leave the two remaining red wires for ignition when tranny is in park/neutral, which eventually feeds the starter solenoid.