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Power supply bus - voltage dilemma
I'm designing a utility bus to supply power to various components on my GEM. The bus is powered by a single lead from a PSU 12v 12.5amps, which is more than adequate.
The bus will be mounted on the mount with short leads to each service - mount power, camera, dew heater, logic (various stuff), LED lighting, power ON indication and a spare 12v outlet.
Not being an EE, and with very basic skills in this area, I'm stumped as to how to maintain 12v across all services (which I have tried to represent with various resistances depending on what I think maximum power demands will be - manufacturers specs and my own measurements).
I think I'm making a fundamental error/s. Having tried a few different configurations, the diagram below is the closest I can get to achieving 12v across all services.
An in-line master power switch (not shown here) reduces voltages significantly, which is not ideal.
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