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Thread: Where is the Neutral Safety Switch?

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  1. #1

    Where is the Neutral Safety Switch?

    Where is the neutral safety switch on a 1963 with a 260 V8 and a Ford-O-Matic? Where is it physically located, and is it difficult to replace?

    Neutral Safety Switch:
    Neutral Safety Switch.jpg

  2. #2
    It is attached to the steering column just behind the dash. Stick your hand around the column and run it down the tube and you'll feel it bolted to the top.

    It's an easy replacement and they don't fail often. Usually it's extra sloppiness in the shift lever that caused the perception that the NSS is bad.
    Patrick Brown
    331 Stroker / T5 / 8" / Wilwood Disks / RRS R&P Steering / Megasquirt EFI


  3. #3

    The park lever engages the starter.

    Thanks. I'll take a look at it this evening.

    My problem is that the starter motor is activated when the ignition is turned on and I pull the shift lever to the left while the transmission is in park.

    I can start the car by pulling up on the gear shift. I have to be careful when putting in park while the engine is running so as not to engage the starter and have it grind against the flex plate.

    I thought "What in the shift link would send voltage the starter solenoid?" The only thing that it can be is the neutral safety switch. Maybe it has shifted or is cracked so that it is shorting when it is pushed to the left.

    I read this description on the internet that would fit my cars symptoms:

    "A neutral safety switch carries starter solenoid voltage when the ignition key is turned to the start position and is controlled when the vehicle gear selector is moved throughout its range from park to 1st gear. A neutral safety switch can become misadjusted due to normal wear of the mechanism that controls switch slider."

  4. #4
    Maybe you have the two wires on the starter solenoid reversed?
    Roger Moore

    63 "Flarechero"
    powered by: 347ci stroker | Tremec T5 | 8" 3:45 TracLoc rear



  5. #5

    Reversed wires?

    Quote Originally Posted by Luva65wagon View Post
    Maybe you have the two wires on the starter solenoid reversed?

    I will look. What would having reversed wires do?

  6. #6
    One of these little wires is from the "start" position on the switch (brown) and the other is to feed 12 volts to the coil from the solenoid while in the Starter is engaged. But it also tees off to go into the cab. So this wire that normally goes to the "I" terminal (red-blue) is also going to the IGN part of the switch, though it is intended really ONLY for the coil. So, if these two wires are reversed, then the key switch in the IGN position would feed 12 volts (actually more like 9 volts via the pink wire) to the S terminal of the solenoid as soon as you turned the key ON - assuming the neutral safety switch was in the PARK position. It sounds like there is a misadjustment going on in the Neutral Safety Switch (NSS) anyway, and so it isn't showing the instant you turn on the key, but is waiting until you yank on the shift handle.

    That said, assuming they are not reversed and the brown wire is on the S terminal of the solenoid and the red-blue is on the I terminal of the solenoid, then at the NSS you should NOT have 12 volts to either wire in the "RUN" position of the key switch. If you do, then follow the red-blue wire from the NSS back to the switch and make sure that red-blue wire is attached to the S terminal there, and not the center terminal (accessory) or "I" terminal (Ignition). Or the B (battery) terminal. Any 3 of these would cause the starter to spin in a key position other than START.

    As a side note, there may "seem" to be a discrepancy in the fact that there is a red-blue wire mentioned going to "I" at the solenoid and another red-blue wire mentioned that goes to the S terminal of the key switch. These are the the same ends of the same wire. They are NOT the same wire path. Don't know why Ford opted to use the same wire color codes on the same component circuit, but going to places on each end, where, on either end they are opposite of each other. But they did. The red-blue from the solenoid actually transitions to the pink resistance wire at the firewall connector, whereas the red-blue wire from the key switch transitions to the brown wire on the firewall connector.

    More info than needed, but that's just me.
    Roger Moore

    63 "Flarechero"
    powered by: 347ci stroker | Tremec T5 | 8" 3:45 TracLoc rear



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