Battery charging stupid mistake

[PortTobacco II]

My stupid story: Over the last month batteries went dead in my boat while on the lift. Just bought batteries 10/2020. I bought Duralast Jump Starter and hooked up battery to try to get the boat to turn over. At one put during my attempts I switched the POS and NEG with the Jump Starter and battery. The boat horn beeped and (being stupid) I tried cranking the engine anyways. At that point I pulled both batteries and brought they to AutoZone where they charged them fully. Put the batteries back into boat and I get NOTHING when I turn the keys. I am hoping at this point these resistors saved me from stupidity? I see that the green 20amp fuses where blown. I switched the 20's but still nothing. My thought is maybe the black ones are blown but I am having trouble finding them. Based on what I did, is this fuse/resistor box the first place to start when trouble shooting or should I be looking elsewhere? Any insight would be appreciated.

 

[Frank Marshall]

In my 2018 FSH 210, there are fuses inline on the wires inside the battery compartment.

 

[Canuckjetboater]

My stupid story: Over the last month batteries went dead in my boat while on the lift. Just bought batteries 10/2020. I bought Duralast Jump Starter and hooked up battery to try to get the boat to turn over. At one put during my attempts I switched the POS and NEG with the Jump Starter and battery. The boat horn beeped and (being stupid) I tried cranking the engine anyways. At that point I pulled both batteries and brought they to AutoZone where they charged them fully. Put the batteries back into boat and I get NOTHING when I turn the keys. I am hoping at this point these resistors saved me from stupidity? I see that the green 20amp fuses where blown. I switched the 20's but still nothing. My thought is maybe the black ones are blown but I am having trouble finding them. Based on what I did, is this fuse/resistor box the first place to start when trouble shooting or should I be looking elsewhere? Any insight would be appreciated.

@PortTobacco II ..... an easy mistake to make. Check fuses first then if that does not correct - which I hope it does - run a continuity test on your Stator.