Leisure battery draining overnight

The second neg looks to be from the solar panel. It’s from the same cable sleeve as the solar pos input.
Which will also probably explain the battery reading of 13.5v
Good spot, the additional cable on the "A+ IN" terminal catches my attention. There seems to be 2 feeds to that and 1 feed back from "B+ OUT" wrapped in the same loom going to the left.
 
OK

So the remaining questions are what are the two feeds on the "A+ IN"

Where are the thin black and red option wires connected to (just visible at the right of your picture) as this seems to be a common cause of misconfiguration.
 
One of the wires goes straight to the vehicle battery with a 30amp fuse on it

The two small black and red wire don’t connect to anything just crimped and heat wrapped the ends
 
You're a T6 so you should have start/stop and a smart alternator?

In which case one of those options wires should be connected - you need the red option wire connected to a +12v source to configure the CTEK to a smart alternator profile. Without that the CTEK will only be engaging in the brief moments the Alternator is fast charging your starter so you'll be getting a poor charge.

Don't connect the black wire to ground (which seems common-ish) as that will select AGM profile and slightly overcharge a normal lead acid battery (which I'm assuming yours is)
 
You're a T6 so you should have start/stop and a smart alternator?

In which case one of those options wires should be connected - you need the red option wire connected to a +12v source to configure the CTEK to a smart alternator profile. Without that the CTEK will only be engaging in the brief moments the Alternator is fast charging your starter so you'll be getting a poor charge.

Don't connect the black wire to ground (which seems common-ish) as that will select AGM profile and slightly overcharge a normal lead acid battery (which I'm assuming yours is)
Okay could the reason my stop/start has recently stop working be anything to do with this
 
Directly no, but generally stop/start problems are because of issues in the main starter charging so those would need sorting before leisure charging.
 
You really need to find out where the second red lead on the A+IN goes to as it’s creating a direct feed to your starter battery. Normally you would only have one cable here taking the feed from the starter battery and as has already been said the thin red wire would be connected to an ignition live in your fuse box so the cetek knows when the engine is running and tops the leisure battery up from the alternator
 
I am currently looking at where that 2nd red wire goes as soon as I find out will let you know
When the engine is running it does top up the leisure battery I can see that on the display
 
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