"Check Trailer Wiring" and "Trailer Brakes Connected" and intermittent loss of trailer brakes

[Boudicca908]

17 hours ago, Wayfinder said:

sounds so similar to my own break issues

This does seem to be a common problem. People have resolved in different ways, having found different causes.  By the way -- we did replace my brake wires in both front and rear axles, but the original rear axle wire was left abandoned in the rear axle. Unfortunately I didn't pull it out that day, because we were working against the clock, trying to finish as the sun was setting. Now it's a lot harder to access. I hope to get it out of there to inspect it though, because I really want to see it. Thanks @Wayfinder for linking the image of your frayed wire -- Wow! That is a mess. The jury is out on my 'fix' and time will tell. 

[Boudicca908]

UPDATE on August 9, 2026:

It has now been 1,800 miles of towing since the wiring work, and NO warning messages have been appearing on my Tow Vehicle ....  I believe @ScubaRx is correct that we had the right avenue for my particular fix. I will update again, if it comes back. Thanks again to @jd1923 and @ScubaRx for all of their help, and to @jd1923's family for their gracious hospitality in Prescott.