Hello,

So I have been busy on my 1981 F250 for a while and am waiting for some parts right now. As this is supposed to be a full restoration I thought I would spend the time on some interior work. While researching I found that my truck is supposed to have a seatbelt light and buzzer come on when the ignition comes on. Now, I have drivin this truck for 3 month every day and I never had a light or buzzer come on. So when I took the glovebox liner out I found the white buzzer for the headlight, which was hooked up and worked properly. Next to it was the green one for the seatbelt buzzer, but it was not plugged in and the connecter is no where to be found. So on the search for the connector I ran across some wiring that I have no idea what it is for, as well as some things that are kinda questionable. So I took some pictures and am hoping that y'all can maybe give me some insight.

This comes up from under the floormat and goes up in the back pillar, I am presuming it goes to the seatbelt(?). The other one is kinda strange It continues to the center of the bench.

After comming to the center of the bench it goes up into the seat(Grey connector). I have no idea what it is for. Maybe yall know more about it. (Sorry for the mess. Havent been under the bench since I bought it)

Then I found this under the dash. The thing in the background is the accelerator pedal for reference. It looks like a hack job and I have no idea about what it does and where it goes. Ill go back and check when my lamp is charged up. But again I am hoping that somone has an idea. (Maybe something for the seatbelt buzzer(?))

This here is a connector that attaches to a switch on the glove compartment door. I am guessing it is supposed to trigger the light socket in the next picture. Although I dont see how that makes sense since it is not lighting up the compartment, but the floor underneath. Maybe someone can enlighten me.

This is the fitting the switch runs to ( at least one of the three wires) Is this supposed to be activated by the glove compartment switch? Also somone know the bulb size on this?

I know that these might be stupid questions, but I am electrically not capable to say the least. I can figure nuts and bolts out, but electricity-wise I just know enough to be dangerous. Hopefully someone can give me some insight into this.

Thank You in advance.

 

See my answers above
Dave ----

 

The picture below tells me your truck had the "lighting group" or whatever they call it. My 1980 had these lights that lighted the kickpanel areas, had map lights on the domelight, had a cargo light that was mounted outside the cab over the rear window, and had a underhood light. Not sure what all the extra lighting option included. But you can see in the diagram below all those lights are fed by the same hot wire(lightgreen/yellow), so that is why it goes from the glovebox to that light socket.

 

Thanks for the input. My truck is a custom with the heavy duty towing package and an automatic transmission. I was not aware that it had like a weight detection to see if you are in the seat like a modern car. That is pretty neat. The biggest thing is that I can't seem to find the wires that are supposed to plug into the buzzer. There is no dangling connector behind the glovebox liner. So if trace the wires from the weight sensor. (I am guessing they run under the floor mat), It should in theory go to the buzzer, right?


It does have those map lights at the dome light and the under hood lights. I am gonna go through my manual to find out the bulb size, gets couple of them and just try and see if they work.

 

It doesn't, it has a wire that goes into the seat belt buckle and the dash buzzes for ~5 seconds when the ignition is turned on if the seat belt isn't buckled; the red warning light on the dash will come on for ~5 seconds regardless if the buzzer buzzes or not.

 

Thank you. That's how I thought they worked based on my research. So that wire should go to the dash and hook up to the light directly?

 

Here's the 1981 diagram. The wire from the seatbelt goes directly to the buzzer.

 

Alright, I have been able to kinda look a little bit around and took my cab apart. When I took the trim off the left side I found the string of cables that are going to the dome light and the seat belt buckle. They all continue through and vanish in the dashboard except for a brown connector. Which I presume is the seatbelt buckle switch(?) (I’ll send a picture in a bit.) I could test it to see if it switches with the seat belt. I’ll just have to do that over the weekend. Apart from that wire the rest still seems vanished. I have been searching under the dash. But no luck. So I took the instrument cluster off in hopes of tracing the green cable back from the warning lamp. Well to say the least. There is a bunch of green wires so no luck there. I’ll have to go and see if I can find a tell to tell me what position on the plug is for what. That should making tracing it possible.

I have also found a connector taped to a cable packet, but it doesn’t have the right colors and I don’t think it is long enough to reach over to the glove compartment. So it probably was some other accessory.

Does anyone have a picture of the connector by chance? The fact that the brown wire was disconnected makes me think that they took the cable pack for the buzzer out entirely, but maybe I’ll find something hidden under the dash while searching around.

Thank You

 

If that brown wire connector was in the kickpanel area on the driver's side, that is the running light wire. That connector is there in case you order the roof lights option. They run a brown wire from the roof lights down the driver's side windshield pillar, and plug it into that plug for marker lights. That brown wire circuit runs from the headlight switch to the front and to the rear to power all the running lights/marker lights.