Backup light / 1-4 issue

[Matt B]

Okay then... New switch arrived perfectly in time for my federal inspection. And your experience was confirmed. It works! That means that these switches use only between 0.04" and 0.08" travel to engage the circuit. Way more precision than I expected, wow. My old one engaged at about 0.08" which apparently already was out of tolerance.
1-4 is still not operating but maybe the selenoid has an issue or was disabled. My initial idea was a relation between both issues as both systems are fed by the same wire. But apparently it was just a coincidence and thankfully I was wrong and it was so easy!!

Thanks for your great support!!!