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some sites call it an ambient temperature sensor. do you have AC? where do the wires go?
another site referenced interior courtesy lights.
Stemco is still in business, makes lots of stuff.
Last edited by 78Broncoinpieces; May 9, 2018 at 09:25 PM.
Reason: more info
The part number traces to a Distibutor Modulator Ambient Switch. It is part of the emmisions.
According to the `72 Prelimanary Manual, Below 49 deg. it allows for normal vacuum advance. When it gets @ 60, the contacts close and it retards the timing.
Some models even had a switch and wiring going into the side of the transmissions as well. Not sure if it was just for manual transmissions, but that's the only place I've ever seen them down there.
The door panel could have had them for either I would assume, but in the Early Broncos that I've seen most of those ambient switches, they did not offer an automatic until the '73 model year anyway.
Only if you're interested in keeping it. It'll probably sit in a box somewhere for a later that never comes, but if you are ever building a truck that has that hole in the door pillar, it'll make a good cover.
That said, I'm sure there are those out there doing restorations on '72 and '73 Ford trucks that would love to have one. But the same logic could be used for leaving it on the truck so the next junkyard diver might find it.
What happens to a truck like that in a junkyard near you? Does it go to the scrapper pretty quick, or will it sit to be picked over for awhile?
....kinda surprised to see that in a 73, I had to drill my own.
