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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Dash wiring identification

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Old Aug 13, 2023 | 06:38 PM
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Dr. Johnson's Avatar
Dr. Johnson
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From: PNW
Dash wiring identification

So in the process of fixing some wiring misroutes I found this big flat plug toward the top of the wiring behind the instrument cluster (this flat plug sits on top of the harness that t’s off the ignition switch.

my question is, what is it? There are two wires that just loop. A RED/BLUE wire and a BLACK/ORANGE wire.

1970 F250
manual trans




 
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Old Aug 13, 2023 | 10:52 PM
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Green72F250
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I think that is your Neutral Safety Switch bypass connection, beings your truck is a manual transmission. Here is an article that talks about it:

Neutral safety switch don't work now? - The FORDification.com Forums
 
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Old Aug 14, 2023 | 12:04 AM
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Phantomtruck68
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From: Moriarty, NM
Here is wiring diagram. http://fordification.com/tech/wiring...-70_master.jpg

Look center bottom of diagram by the dimmer switch.
 
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Old Aug 14, 2023 | 12:07 AM
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From: PNW
Originally Posted by Green72F250
I think that is your Neutral Safety Switch bypass connection, beings your truck is a manual transmission. Here is an article that talks about it:

Neutral safety switch don't work now? - The FORDification.com Forums

I think you nailed it, sure looks like the critter. Wonder if a guy could steal switched power from that line? 🤔
 
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Old Oct 5, 2023 | 12:42 AM
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From: Az
Originally Posted by Dr. Johnson

I think you nailed it, sure looks like the critter. Wonder if a guy could steal switched power from that line? 🤔
nope, one side is crank only and the other is for the reverse lamp circuit I believe. I know without that jumper it won't start.
 
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