I don’t know anything about tape but if you are using the wire nuts, especially on home wiring, make sure you twist the wires together first, then put the wire nut on. Wire nuts are meant to just hold the wires together but not to properly twist the wires for a good connection. Thus sayeth . . .
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Crimp splices are much better for stranded wires than wire nuts. Wire nuts are a lot better than just tape alone, but wire nuts don’t hold as securely to stranded wire as they do to solid wire (house wire). Additionally, a lot of low-wattage lighting circuits in cars’ interiors I’ve found to be 16ga and 18ga, and it’s important to keep all the strands intact as best possible. Crimp splices will do this better than wire nuts.
NOTE: I’m very aware that typical household lighting fixtures often use stranded wire, often as small as 18ga. But they attach to solid wire, and with the integrity of the solid wire supporting them they hold wire nuts better than two stranded wires being attached together.
I tin the leads of stranded wire with solder before splicing.
But for a house wire nuts meet code and crimp splices don’t.