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All power supplies will have a draw on the supply side (24 volts in this case) so it is best to take from a switched source so you won't drain batteries when the vehicle is off. Get your negative from the rear battery.

Common on any switched mode power supply. There is a large capacitance on the input side (24 volt) which acts like an instant short until the voltage equals battery voltage. For safety, most have a high value bleed resistor or other load to drain this voltage when off. Which means the...