Richard --- I don't think ANYBODY could be able to diagnose your issue via the internet. A guy would have to write a book about what he might go about checking and looking at..... particularly since YOU wired the car recently. That means nobody would be able to SEE what is going where - how it was run - or what you might possibly have done wrong.
I would first ask if you think your battery is fully charged - and when you say you have 12V --- is that actual 12V? Or is it more like 13.2V etc.... because a 12V reading on a resting battery is telling me the battery needs charging... So that's where I'd start.
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