There was a thread about this not too long ago. It probably gave up because the strike bolt either shed its plastic sleeve, or shifted too far forward. If you have a T-50, you can loosen the driver's strike bolt and move it back about 1/16". It helps to draw a circle around it with a marker so you can make sure you only move it back & NOT up or down. The circle is good if you have to replace it, too, because you can put the new one back in exactly the same spot.
The switch is usually on the driver's latch inside the t/g, but it might be behind the center support when you pull the t/g access panel. Either way, if you find you need/want to defeat it, just short its wires together. You might use a Scotch connector clamped across both wires (unreliable), or a double male jumper plugged into both wires (very effective & easy to undo).
thankfuly when my switch stopped working it was warm out. (although for the most part it's always warm here in s. florida) I didn't know about the safety switch an I wound up cutting all the leads off of the key switch. Then I found a posting here about the safety switch. I was fortunate enough that I left enough wire leads from the switch that I could reconnect them. Don't do what I did because the switches (new) are special order and around $100.
Someone must have done that already. Just as well, because I enjoy being able to put the glass up when the tailgate is down so I can get at the internals and wash the inside without crawling into the back.
The downside is they gutted the rear key, so you've gotta go inside to put the gate glass down from the dash. At least it works that way.
Just a tip, once in a while I can't get my glass to go back up. When that happens I putthe gate down, start the glass up about 4 inches, then close the gate and finish raising the glass. This almost always works for me.
Thanks! I'm not sure how to do this, but got it booked in for Friday with my tech guy and service advisor, who both drive Broncos. I'll be printing out your e-mail to take in Steve. Appreciate all the help. As usual!