Fastronix cicuit breaker.

[Blg8588]

So I went to install an electric tongue jack and started looking at the wiring, idecided I was going to change out these fuses due to the corrosion but I'm wondering why the large AWG is larger than the boots and if somebody see something wrong with this picture befre moving forward?! The boots were all wore out cracked and it appeared like the wiring was too large for the boots. Any information advice would be nice thanks.

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[Buly]

These CB are poor quality with flimsy covers and the hardware rusts. I have used them for my canoe trolling motor. You should replace them with marine grade circuit breakers, but they could be more expensive. You can get away with automotive fuse holders in water tight rubber housing?

https://www.amazon.com/dp/B081YDV8PS/?tag=rvf01-20

Also the terminals should be replaced with built in shrink wrap terminals to reduce water intrusion if you are going to use the Fastronic CB.