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On my '86 Bronco, there are two wires that run into the driver's side seat belt. Once I pulled them and put wire nuts on the end, no more seat belt chime. I would bet that yours works very similar.
Yellow light? Our trucks have a red seatbelt light that comes on for a few seconds when you turn the key on. I've never seen one flash. Are you sure it's not the yellow airbag light you're seeing? If it's flashing, it means there is a problem in the airbag system.
I know my 94 F150 dosen't have a seat belt idiot light that's connected to the seat it's self. But that could be because it's an XL. My guess would also be the airbag.
All trucks from the 70's up have a switch in the driver's seat belt that'll make the buzzer or chime sound with the seat belt light when the key is turned on if the belt isn't fastened.
That is the air bag. If I were you I wouldn't even try to diagnose and fix that myself. Take it to the dealer. There are very few shops that know how or have the proper tools to fix that but I can give a little help if you must do it yourself.
First off does your horn still work? That will tell me a lot.
After the several posts during the day, I went out to my truck, started it up and got a 3-2 flash pattern on the airbag light.
Then I tried the horn - at first it didn't work, then it kicked in after a few tries, and the airbag light flashing stopped.
Tried again this morning, and no flashing lights, but the horn didn't work right away either.
I hate intermitent, inconsistent problems - perhaps cleaning the
'contacts' (do I need to take the steering column cover off to get at these?) will resolve the prob ?
Will poor horn contacts set off the airbag idiot light ?
I am 99 percent sure you have a bad air bag clock spring or SIR coild or whatever your parts store calls it. I have never seen a part with so many names in my life. It is a common problem and if you feel like taking it on yourself I can help walk you through it. I did two of them last week so it is fresh in my mind. If it has an intermittant open circuit it can be dangerous. The air bag has a good chance of not working when it needs to and you already know it messes with everything else on your wheel. Horn, cruise and all. Let me know.
Oh none of these parts are fixable , they have to be replaced. So no you can't just clean the contacts. There aren't any you could get at even if you wanted.
It's definitely the clock spring, and the airbag system is TOTALLY safe to work on at home. You don't have to unhook the battery or anything special - as soon as you unplug the airbag, it goes safe automatically. Changing the clock spring is an easy job to do at home for a reasonably intelligent amateur with a few tools.