Thanks, the lodger and Slob, brilliant and quick response
So pin 2 can be isolated altogether - good, less congestion above the battery
If I connect to the positive side of the fuse the voltmeter will be on all the time so could I connect the voltmeter to the blue-black in the wiring diagram above it would only be live when the ignition is on? - I think.
I will not be putting the lithium-ion battery on an optimate as I have read that conventional battery chargers have programmes that are designed to kick start/condition a lead-acid or gel battery but this is not what lithium-ion likes for either longevity or safety.
I will have to buy a specific lithium-ion charger at some point.
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