Not really sure. The issue we had was just not getting them to work consistently. Others have had no such issues, but there's no way to tell what the different parties might have been doing differently, or how their Bronco wiring was set up.
First I've heard of your issue, but nothing surprises me anymore!
Generally speaking the CH stuff is still good, but with much of it very likely being sourced from overseas just like most other manufacturers, they're probably subject to the same inconsistencies that we see pretty much across the board these days. We've been bemoaning the state of replacement products for several years now.
I was lucky to have grown up at a time when literally 99% of anything you bought from a mainstream supplier was going to work without question. And possibly the very few that didn't were screwed up by a consumer and then returned and put on the shelf!
But nowadays, it's a total crap-shoot.
Sorry, rant aside, I have not heard of the CH switches doing what you're experiencing.
Can you tell us how your Bronco is set up? Old and original and half worn out, or pretty much redone in the wiring department? Rusty body perhaps?
Reason I mention rust (or new paint for that matter) is that the windshield frame is not very well grounded after 40 years. And the dash is not that far behind sometimes.
So just wondering if your switch's problem could be ground related?
Maybe run a test jumper ground wire from the wiper motors to the battery just to see if that changes how things act?
Good luck.
Paul
