all weekend the lamp out warning light on the dash has been coming on a dinging alarm sounds. found a light out on the bumper for the plates, but still dings and the light comes on mainly when you push the brake. but all the brake light bulbs seem to be working????

 

but all the brake light bulbs seem to be working????


Are all "three" brake lights working?

 

Yes, 2 on the back and the third on the cab..
It just starts dinging without using the brake also and I have noticed if I turn one of the turn signals on it will stop for awhile. ????