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1966 Mustang 289/306 3spd coupe, 1966 Mustang 289 C4 coupe, 1965/64.5 Mustang 289 4spd convertible
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That two prong plug is indeed the washer pump harness end. The W/P extension is available reproduction, as well as the washer pump if you decide to keep it factory. They're not terribly expensive. I could be wrong but I believe the pump is earthed through the pump mounting screws. If I remember after work I can look at my wiring schematic or at my '66 and possibly find out what the chopped red wire is unless someone beats me to it.
 

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1966 Mustang 289/306 3spd coupe, 1966 Mustang 289 C4 coupe, 1965/64.5 Mustang 289 4spd convertible
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806 Posts
Wow...that's a new one to me. Thanks.
Thanks to the age of texting, a lot of acronyms out there now. Use to just be military guys. Americans in general use them quite often.

I only get slightly annoyed when some are spoken. When one says LOL out loud, shouldn't they just be laughing?

Other spoken acronyms make sense spoken when in polite company. FUBAR or SNAFU for example.
 

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1966 Mustang 289/306 3spd coupe, 1966 Mustang 289 C4 coupe, 1965/64.5 Mustang 289 4spd convertible
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806 Posts
That would be great, thank you. So you are both saying that the duo plug are live and earth for the pump. Trouble is the live seems intermittent, and the earth does not seem to earth. I am wondering if the switch is dirty and not working properly ?
My thoughts on this are both are switched hot, just different pathways from the switch depending on the wiper speed, the earth/ground is when the pump is screwed to the inner fender which is part of the body, thus earthed/ground by the body ground from the battery. (I could be mistaken)
 

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1966 Mustang 289/306 3spd coupe, 1966 Mustang 289 C4 coupe, 1965/64.5 Mustang 289 4spd convertible
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806 Posts
^ to test this theory, you could use either a Volt meter earthed/grounded at the pump must location, or a test light hooked to the pump location. Then use the hot probe on each terminal of the duo connecter with the switch on speed one, then on speed two to see if you get voltage or a light.
 

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1966 Mustang 289/306 3spd coupe, 1966 Mustang 289 C4 coupe, 1965/64.5 Mustang 289 4spd convertible
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806 Posts
I have factory type 2 speed wipers, and pulling the knob straight out when the wipers are on or off will activate the pump. The two speeds are slow and really slow. :ROFLMAO:
Still beats the vacuum wipers on my '54, you could control the speed with your right foot. As you accelerated, vacuum to the wipers was decreased, and they would slow or just plain stop. I didn't use them often so I never bothered looking into it.
 

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1966 Mustang 289/306 3spd coupe, 1966 Mustang 289 C4 coupe, 1965/64.5 Mustang 289 4spd convertible
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806 Posts
BUT if they are both lives (HOT when switched) wouldn't they both be insulated at plug, instead of just the one ?
That makes sense, I didn't take that into consideration when I came to my conclusion. After looking at the posted wiring schematic, it appears you are correct.
 

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1966 Mustang 289/306 3spd coupe, 1966 Mustang 289 C4 coupe, 1965/64.5 Mustang 289 4spd convertible
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806 Posts
It just makes sense to me that they would be a live and earth. I will try and understand that wiring diagram LeeFred sent, but I usually find diagrams confusing.
Yes, they can get complex and fairly confusing. LeeFred was nice enough to highlight the live wire path with red, and the factory earth wire path with yellow, to somewhat simplify it.
 
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