I second the "Good job!"
RV manufacturers are famous for using self-tapping screws directly into painted metal to establish grounds. Sadly, the only connection ends up being the threads that happen to touch the metal. Over time, those corrode.
Proper method is to scrape the paint on both sides, drill for a bolt and bolt the connection so that the bolt head, the connection and lock washer all have good positive contact with a larger surface area. Final touch is to spray with battery post corrosion paint (or similar).
When I troubleshoot (too often) I carry, CRC contact cleaner and lubricant, crimpers, spare connections, dielectric grease and my meter. I always pull fuses and measure their resistance, then spray the holder and fuse ends with CRC - same with any connection - pull apart, tug on wires to make sure they're tight, re-crimp, spray, reinsert several times and then goober it with dielectric grease. I'm betting I've been solving many "future" problems with this habit!
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2008 Phaeton 36QSH, Safe-t-Plus, Quadra Bigfoot
2017 Jeep Cherokee Trailhawk w/ flat tow wiring mod.
Blue ox, BrakeMaster + BrakeAway, diode lights and charge.
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