Clicking sound from where home battery is.

So we were driving andy wife kept hearing a clicking sound almost like a blinker clicking comming from under the stairs and next to the refrigerator whole area situation. It would stop for a bit and then start up again. Always with the same cadence but not necessarily the the same length of time. I looked at the battery and it looked ok and there are some other wires that I'm not sure what they do. Any suggestions/help would be great. It seems to be only when we were driving we're hooked up to shore power now and it's not doing it.