Re: Road train lighting
Each output of the opto coupler has the 50mA max. So the safest would be to splice it into the first trailer then run things back to the second trailer and dolly. Also you don't really need a 7.2v battery. Just the voltage to run the LED's. Using a big battery like 7.2v you'll need drop the voltage down a good amount.
To me 50mA isn't really enough which is why the opto couplers I use have a max of 600mA outputs. Even if I have to use multiples when it comes to the size on a circuit board it's still a small circuit.
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