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Go Back Forums > 66-77 Ford Bronco > Bronco Tech

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Old 12/03/19, 01:53 PM   #1
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Joined: Aug 15
Posts: 201
Wire HarnessRepair

The neutral safety pigtail that comes out of the firewall has heat damaged wires.Two of the four wires are broke off 2 inches into the engine compartment, and 1 1/2" from the 4 connector(2male,2female) plug whos wires goes down to the auto trans. I would like to cut the neutral safety harness 6 to 10 inches before it goes thru the firewall and replace it up to the plug and wires going down to the trans. The only two sources for that portion of a neutral safety harness I can think of is: Go to a wrecking yard and buy the piece that is still in good condition, or buy a new (possibly used) neutral safety switch with harness. Cut off the switch and use the harness in reverse direction. Any thoughts? I also need to replace the trashed, 46 year old engine top wiring harness that plugs into the red three wire firewall plug and goes to the oil, water temp., and ignition wire. Thanks for any advice!
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Old 12/03/19, 02:03 PM   #2
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I just ordered a bunch of these weatherpack connectors to wire up my fuel pumps, lights, wipers, and fuel tank sensors. This would probably work, although if you get the 2 of the 2 connectors, it's a significant savings off the 4. Then just add some new wire. I ordered over $50 so shipping was free but of you're only ordering a few pieces it's probably cheaper to get them from Amazon.

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Old 12/03/19, 02:53 PM   #3
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Vancouver, Wa
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Posts: 145
The connectors are great and are what is installed on my Centech harness. I would recommend the installation crimpers and also the removal tool

1968 Bronco
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Old 12/03/19, 04:29 PM   #4
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San Jose, CA
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I've converted the 4-wire NSS plugs to Weatherpacks as well.
You'd have to convert the switch side every time you install a new switch of course, but in the overall scheme of things, how often does that happen?

There are those 4-wire trailer connectors available as well, but I don't think their pin orientation is the same as the NSS original. Not sure though, because even though I've thought of it, I've always used Weatherpacks for their ease of use and overall weatherproof performance.

An alternative is simpler, less high-tech by a long shot, but equally effective. And that is to use those old fashioned terminal strips instead of plug-in connectors.
I did that when repairing my original red 3-wire firewall plug that John was mentioning. Went to Radio Shack, bought a terminal strip (black plastic base with stainless screws & terminals), and crimped ring and fork terminals to the ends of the wires, and presto. A brand new and very effective junction block with multiple positions.
I think I got one of the 4-position ones, but you could get a larger one (or multiple short ones) and do all the under-hood wiring.

When my red connector was dying a slow but painful death, this extended the useful life of those wires life by many years.
It's cheesy looking by modern standards, but is in fact what factories used in some situations back in the forties and fifties.


'71 Wagon, 3.5" WH, F150 disc brakes and steering, 4.11 33x11.50 Thornbirds, Kayline soft top, Hanson bumpers. "Built, not bought"

'68 LUBR, 2.5 + 1 WH, 31x10.50, 4.56, Explorer and 4R70w by EFI Guy, WH disc brakes, Hanson front bumper, Warn winch. "Bought, not built"
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Old 12/03/19, 08:09 PM   #5
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Anyone know up to what year Ford used our style neutral safety (On other Fords as well)? Eventually I'll probably replace the wiring harnesses but I need to repair it now so I can get my Bronco running. The rebuilt engine and trans. are just sitting on the garage floor and I don't want to start any more large rebuild projects until the truck is running. Spicing in factory Ford wires(if in good condition) will get the Bronco running and down the road a couple of years. I'm looking for any Ford with similar wire and connections, the newest year possible. Thanks for any help in finding those wires and connections!
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Old 12/04/19, 06:25 AM   #6
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1968 Ford Bronco Wagon And 1964 1/2 Ford Mustang Coupe

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If you want to go the route of good stock replacement harness pieces I would recommend NE Classic Ford parts - “delconick” here. He has a lot that are tested and ready to go.

1968 Bronco U15 - Pebble Beige 289 V8, 3 speed manual w/ Rancho Overdrive and 1 BL

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