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Cuppa has covered most things except that the isolator has an on/off delay.. Ie less than 12.5v for >5seconds will disconnect. It shouldn't connect/disconnect immediately so t looks like it's...

A couple more thoughts.

The wiring you have does look on the thin side. The following chart from Redarc says what minimum thickness of copper you need. I always use heavy battery cable for...

A bit of a guess on my part.

First the red(!) negative wire appears to 'twitch' in response to the VSR (Voltage Sensitive Relay - ie the battery isolator) switching on/off - a physical response to...