I'll take the sidepipes over the beak.....sorry :(
Your charging system has a problem. Power is not getting from the alt to the batt, and it's probably getting lost in the bulkhead connector. And if that is true then I bet that is the source of the no crank as well. It takes power to energize the starter relay. Perhaps more than the bulkhead disconnect can pass. Power is electron flow, not necessarily volts. You can pass electricity thru a single strand of 14Ga wire and read 12V . But just try sucking some electron flow thru it and watch it evaporate.
Go straight to the bulkhead disconnect. Disconnect the battery and check the two fat boys in there.