I wired in a 12v cigarette lighter plug under the end of the bed for a 12v fan when no 110 was available. While I had the access panel off for all the wiring I also checked out the transfer switch. Good news...no signs of hot/melted wiring or caps! I went ahead and took the tape off finding the twist caps fairly loose on the solid to stranded wires. So, I went ahead and installed butt connectors on the mismatched wires using some die-electric and this F4 self fusing silicone tape. I am very happy with the resulting joints.
I had never seen the F4 tape until about a year ago. I went ahead and tried it on a power supply for my laptop that kept breaking the wire where it flexes. This stuff sticks like feathers on honey and has kept my power wire in tact since January when I did the repair. This stuff is pretty cool!
https://smile.amazon.com/dp/B001HETI...=aa_scomp&th=1
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