What is this??

[MnkyBiz]

As I am merrily disconnecting every bit of wire behind my dash, I notice two leads going into the driver's side door-hing post!

What the heck is this guy?? Does anyone know it's purpose? My new door post doesn't have a hole for it, so I want to know whether I need to cut one before I weld the replacement in!

Thanks all!

Bill

 

[MnkyBiz]

It was located....

This is where I removed the item from!

 

[broncolove]

Dome light sensor switch.

 

[MnkyBiz]

A dome light sensor switch! I thought it was something like that.

Are these still sold? Can replacements be found?

 

[broncolove]

I have not seen anyone that sells them. Used may be your only option. They are a weird switch.

 

[MnkyBiz]

Do you suggest NOT cutting my new door post to accomodate? Get myself a "push" switch instead?

 

[broncolove]

Depends on how original you want to keep your bronco. I personally would use a modern switch.

 

[MnkyBiz]

I like the looks to be original, but functionality is the first need of this vehicle!

NEW SWITCH TIME!!!!

 

[6677ebman]

Dome light switch?? I know for a fact Ford called it an "ambient temperature sensor", I was thinking it went into the manifold??

 

[MnkyBiz]

6677ebman,

Not that I am doubting you, but are you sure of that? I can get the numbers off it , if it is needed. Why would an ambient temp gauge be kept in the door jam? How did you learn this about the part?

Thanks

Bill

 

[6677ebman]

It might not be a fact, but a guy I know who has forgotten more about EB's than most of us know told me (a long time ago) that it was an ambient temperature sensor, and he's the kind of guy you didn't argue with!!

 

[74bronc]

Doesn't look like it is factory to me. It doesn't look like it has a FoMoCo part number on it either. My '74 has the hole in the post like yours but no switch. I was under the impression that EB's never came with a dome light that turns on when the door is opened. I could be wrong.

 

[6677ebman]

Every U-series (truck, van, Bronco) from '71, '72, & early '73 had those on them, whatever the heck they are. I've had several '71-'72 F100's that had them, too. I'm sticking with the ambient temp sensor thing;D ;D Sounds good to me

 

[MI-Bronco]

My '74 has the same hole with a plug. The shop manual references a courtesy light sensor switch on the Econoline, but I don't see anything like this for the Bronco.

 

[admin]

I'm pretty sure 6677ebman is correct and that it's part of the emissions system.

It's not a dome light switch because there's no actual switching mechanism. It is a FOMOCO factory part. D2AF follows Ford's numbering convention for a 1972 part. My '72 has one with part #D2AF-12A164 and is stamped with both a Ford oval logo and "SEMCO"

 

[MnkyBiz]

Mine has the same numbers on it, but STEMCO.

 

[byrddog]

I went out and checked, my 74 has a solid rubber grommet in that spot. Not much help, I know.%)

 

[tcjones76]

Where do the wires lead?

Has anyone traced the wires from this what-u-ma-call-it?

 

[gooshawk]

The part number traces to a Distibutor Modulator Ambient Switch. It is part of the emmisions.

 

[gooshawk]

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.