Locutus
Before you spend 3-400 on a higher amp system, first as suggested, replace the circuit breaker. Then using your shop manual, start at the battery and go forward with your system. Your first check should be the 3 wire main harness under the fairing. The red wire will be the one supplying the power to the bike. If the voltage there matches the battery voltage, check on downstream. Soon after the 3 wire connector, the red wire will have a splice, follow both ends and check voltage at every connection. remember to check voltage at the battery before checking at the connection so that you can be sure to get accurate readings.
I checked mine all the way to the switch with the results agreeing with the battery voltage. Coming off the switch the voltage was good to the first connection. It had dropped there so I knew the switch wasn't the culprit but probably a short or wire chafe after the switch. I repaired everything and taped places it could chafe or used shrink wrap to provide extra protection. Just slit it lengthwise and then put it on the wire and tape it with good electrical tape. Check your grounds, especially, for me, at the headlight harness where several grounds were spliced into the ground to the headlight. That seemed to make the biggest diffference.
A little elbow grease, patience and a Volt ohm meter did the trick for me. I'll bet it will for you too and all you've invested is some time. If your problem is ground or wire chafed short, a new higher amp system will not fix your problem. Come on, if I can do it, you can too
Bubba