Oneoclock

My Boss bought a '23 Silverado 2500 Diesel in Mar. '25, and we have been having an intermittent A/C blower throughout this summer, where after the truck has been running for half an hour or so, if we shut it down for 5 or 10 minutes, on restarting, the blower does not run at all, until the truck has been shut down for several hours, like at the end of the work day. Not the fancy radio, no Navigation or digital radio, just plain jane AM/FM/BT radio. Any ideas where to have the mechanic start to look?

I have just learned that this 16' dump trailer is also not working with a Ford pickup, which shows trailer wiring notice when connected. So, I think I'm now heading in the direction of the trailer as the cause of this problem, and not the Silverado.

I've read this whole thread. Thought I understood the issue completely. My boss just upgraded from his '07 gas Silverado 2500 to a '23 Diesel Silverado 2500, and it has been pulling both of his 16' dual axle trailers fine. Until he charged up the big battery that runs the hydraulic pump on the dump trailer. That's when we noticed the "Check Trailer Wiring" message in the DIC. On and off multiple times while driving, and no trailer brakes. So, I have a diode and was looking into the best place to put it, but first I simply disconnected the line on the big battery which connects the emergency breakaway switch from the brake system, and this did remove the +12 V from the 7-way trailer connector. (on the +12V pin) Seems to me this is the outcome the diode would provide, while leaving the breakaway system intact. But, even with no current feeding back on the trailer connector +12 V pin, the truck still does not like it, and continues to read "Check Trailer Wiring". The truck has no problem with the other (non-dump) enclosed trailer by the same manufacturer. Also, his '07 has no problem with either trailer. I am still not understanding this system.