Amendolaro ,
i will try to help you : i will not get in color of the wires to avoid confusing more .
Basically you can power without problem many devices from one control switch AS LONG you
splice together the Positive of all devices . The negative , also called Ground can be taken anywhere
on the chassis.
It is very basic.
Along the positive wire you should place a fuse from 2 to 5 amps , just as an added safety .
Questions welcome.
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