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Neutral safety switch
#1
Hey guys it’s been a while since I’ve posted. My Mustang project was put on hold for a few years and I just finally got started back on it. The good news is I got the engine running and boy it runs great. I’m having problems cranking the engine from the key switch. I can start the car by jumping the solenoid.  I have a 460 with a C6 transmission.  Have installed a new ignition switch, starter solenoid and cleaned the key cylinder.  The previous owner had a manual transmission but I installed an automatic.  Is there anyway I can bypass the safety neutral switch just to verify this is the problem? Once I know this is the problem then I will figure out how to install a working neutral safety switch.  There are several wires on the driver side apron that seems to go nowhere. I believe one of these may be for the neutral safety switch. Any help would be greatly appreciated.
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#2
NSS wires are red/blue. There should be a 4 pin square plug on the headlight harness that mates with the NSS/Backup Light harness. Simply jumper the two red/blue wires to bypass the NSS. Be careful that the car is NOT in gear.

Let me check your shorts!
http://midlifeharness.com

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#3
(07-05-2019, 07:31 PM)midlife Wrote: NSS wires are red/blue.  There should be a 4 pin square plug on the headlight harness that mates with the NSS/Backup Light harness.  Simply jumper the two red/blue wires to bypass the NSS.  Be careful that the car is NOT in gear.
I just tried that and still nothing. When I turn my key in the on position I don’t even hear the electric fuel pump running. The way I wired my solenoid is the big yellow wire and battery cable goes to the left (front) big post on the solenoid and the rear big post to the starter wire. The red with green stripe goes to the i terminal and my fuel pump relay wire and the red with blue stripe wire goes to the s terminal. I have a one wire alternator going to the battery.
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#4
Time to isolate where the problem is. Disconnect the NSS/BU plug and probe the red/blue wires from the headlight harness: one of them should be 12V when the key is in CRANK position. If neither one is, you may have a bad ignition switch or faulty wiring somewhere.

Let me check your shorts!
http://midlifeharness.com

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#5
(07-05-2019, 09:43 PM)midlife Wrote: Time to isolate where the problem is.  Disconnect the NSS/BU plug and probe the red/blue wires from the headlight harness: one of them should be 12V when the key is in CRANK position.  If neither one is, you may have a bad ignition switch or faulty wiring
I checked and one of the red wires with blue stripes will light up only in the crank position. I hope this is a good thing.
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#6
The only time the red/light blue wire that is connected to the "S" terminal, and the only time the "S" terminal, have voltage is when the ignition is in start position. This means the only time your fuel pump will run is when you are trying to start the car.

Yes, that is a good thing, only one of the red/light blue wires should have voltage with the ignition in the start position, when the connector is not connected. That is the side that comes from the ignition switch, the other one goes to the"S" terminal on the solenoid. Jump those two wires together and see if you have start voltage at the "S" terminal.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#7
I would almost bet your ignition switch is out of position. When you turn the key there is a rod that goes down the steering column and links to the ignition switch. There are two bolts holding it to the column. Loosen the bolts and slide the switch toward the steering wheel. See if that works.


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[+] 1 user Likes Carolina_Mountain_Mustangs's post
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#8
(07-05-2019, 11:37 PM)Don C Wrote: The only time the red/light blue wire that is connected to the "S" terminal, and the only time the "S" terminal, have voltage is when the ignition is in start position. This means the only time your fuel pump will run is when you are trying to start the car.

Yes, that is a good thing, only one of the red/light blue wires should have voltage with the ignition in the start position, when the connector is not connected. That is the side that comes from the ignition switch, the other one goes to the"S" terminal on the solenoid. Jump those two wires together and see if you have start voltage at the "S" terminal.

Thank you, thank you, thank you! I tapped into the wire and now I can start the car using the key. Now I just need to figure out how to incorporate a NSS to the C6 transmission ?
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#9
(07-06-2019, 10:03 AM)Carolina_Mountain_Mustangs Wrote: I would almost bet your ignition switch is out of position. When you turn the key there is a rod that goes down the steering column and links to the ignition switch. There are two bolts holding it to the column. Loosen the bolts and slide the switch toward the steering wheel. See if that works.

I thought that too so I dropped the steering column and disconnected the rod then manually controlled the ignition switch by hand just to be absolutely sure.
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#10
The NSS mounts on the shift linkage on the side of the transmission. This thread and other links in it should help
https://www.7173mustangs.com/thread-neut...tch--32140



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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