Yes Sir, what Brett tells you is correct. They are Automatic reset, circuit breakers. They have bi-metal springs inside them that get's burnt and causes carbon, suit and other non-conducting materials between the contacts. So, that's what appears to be your issue. You can, temporarily, do a test to confirm this. Simply disconnect the terminals from them and put the wires together.
Then check your voltage at your house batteries. It should be the same as the output of the charger, whatever type charger you have that is. It might be down by a tenth of a volt or so, due to voltage loss of the distance and or any connections. But, if it's way up from your present voltage, you've found the problem.
And, as has been suggested, just cruise on down to your local Auto zone or, any auto parts store, and pick up a couple. You really don't need an RV supplies or service center for them. They're common in the industry. Good luck.
Scott