NSS Install problem?

[stephanorf]

OK, so I read through about a bazillion other threads asking various questions regarding the Neutral Safety Switch. I thought I had it figured out, but alas, poor Yorick.

So if I get it, on my brand new under-dash wire loom, I'm supposed to separate the ignition wire connection near the firewall (circled in the pic below) and then connect my NSS into the loom. That makes perfect sense! I can see the Red-with-Blue-Stripe wire near where the plug goes through the firewall, right next to the two Red-with-Blue-Stripe leads coming from the NSS loom. Bingo...here it is:




Ah...but it can't be as easy as that, can it! Once the wires circled above are separated, it becomes obvious that there is a size discrepancy between the NSS wires and the above mentioned wires. See pic:



the NSS wire connections are too big to fit in the itty-bitty tiny little terminals in the under-dash loom. There's no way they're going to fit together. Arg!

I haven't ready anything about this in any of the threads I was scanning.

Has anyone else run into the same issue? Do I need to cut and splice my brand new loom to get this to fit?

Thanks,

[stephanorf]

Hasn't anyone else run into this issue? It is a new loom from CJ Pony Parts and an original FORD NSS harness.

Thanks!

[4mustangs]

Originally Posted by stephanorf

Do I need to cut and splice my brand new loom to get this to fit?

Thanks,

It would be helpful if you would show all four terminals with better lighting. If the yellow end that is pointing up is a male then it appears to be the same size as the red male pin. If this is true they both should have females to plug into. If the yellow one is a female then your right it is the wrong size and you need to replace one set to match the other. If this is the case, because connectors are always a weak link, I would remove all four and replace with a solder splice covered with heat shrink tubing. This would give you the best and longest lived connection.

This link shows one way to do it:
Soldering Tutorial: Inline Splicing - Socialphy

Stagger your splices as below and don't forget to slide the heat shrink tubing on before you connect the wires.

__________________________________outer
__________inner
-----------------Splice----------------------------wire
__________inner
__________inner
---------------------------------Splice----------------------------wire
__________inner
__________________________________outer

Heat shrink wall __________

[bartl]

Can't really see the detail to well, but if you're sure you have the right wires then I'd "repair" the under dash wiring to match the OE NSS harness. Yeah, it's probably easier to do it to the NSS harness, but we KNOW that one is right.

[stephanorf]

Here's a closeup of two of the connectors. The connector on the left is in the under dash loom, and the connector on the right is the NSS loom. As you can see, the male connector is way to big to fit into that female connector.



I wish I had realized this sooner, because now if I want to splice the new loom it will be very difficult since it is so high under the dash and close to the firewall.

I have an urge to create an "intermediate" connection to bridge the two terminals without actually cutting either one of them.

[stephanorf]

Originally Posted by bartl

Can't really see the detail to well, but if you're sure you have the right wires then I'd "repair" the under dash wiring to match the OE NSS harness. Yeah, it's probably easier to do it to the NSS harness, but we KNOW that one is right.

Hmm...well, I'm not completely sure I got the right wires. I'm doing this for the first time and there seems to be a lot of discussion about where the NSS loom plugs into the under dash loom.

ok, here is a closeup of the wires I took apart to add the NSS circuit. This is a closeup of the section where the gauge feed goes through firewall. Can anyone confirm that this is the correct place to add the NSS circuit?




Hopefully someone on VMF has re-wired a 1965/6 with automatic transmission using a stock-style replacement under dash loom.

Thanks,

[bartl]

The NSS taps in to the wire coming off the ignition switch "S" terminal, which should be Red with a Blue tracer, so that the NSS is in series with that circuit, which then proceeds to the "S" terminal on the Starter Solenoid. An Ohmmeter can help you trace the circuit.

[stephanorf]

Alright, evidently there are two NSS under dash looms. I think the 1965 loom has the larger connectors and the 1966 has the smaller connectors.



I think the one on top is the 1965 version, and the one on the bottom is the 1966 version.

At least I have one that fits!

Thanks for all of your help.