Fuse vs Breaker

Thank you KENO.  I didn't realize they were switches as well as breakers and I definitley don't want some empty holes in the dash. I went ahead and replaced all the fuse holders as a precautionary measure. I also grabbed some extra fuses just in case, but still need a couple more sizes. Some of them were crumbling as I was taking them apart so it seems like it was a good time to replace them. 

While on the water this weekend I had a moment when the boat wouldn't start. Didn't appear to be getting any voltage to the key switch. I got out the multimeter and started measuring and I guess I jiggled something and it started working again. Thanking my good luck and not wanting to chance it, I left it as is and headed back to the dock. It was time to head back anyway and we had been out all day so not really any time on the water lost. But, I am assuming it was a poor connection from the fuse holder terminal to the +12V of the key switch. So I want to replace all the fuse holders, switches, and possibly the key switch to avoid anything like this in the future.