Very good info Nomad, I know we always use crimps for wire on aerospace and military but I use solder connections in my truck for over 20 years with 0% failure, on a RV have you had any solder connection failures at wire splicing ends. I know we have connector pins and relays that are soldered to the components and have flown for over 30 years but I was wondering why they never solder splice the wires. You would think it would be stronger. I have seen many crimps fail from vibrations in the past. I know on the space shuttle we had high and low temp crimps and solder is useless in high temp areas or space apps due to extreme heat and cold. The truck never sees anything above 150 degrees high and 20 below low and haven't had any failures on solder yet when traveling. I never had a RV and I'm sure you have a lot more vibrations than the truck.