Hi all, not sure if this it the right place to ask..
I have a trailer with a battery and small 12v water pump mounted in it.
I have tied in to the lighting circuit to supply power to the battery when driving (lights on). This should maintain the battery and give me the option to run the pump off the car if the battery is flat. (engine running, lights on)
Obvious problem is that the lights on the trailer will be on all the time, using the power from the onboard battery unless I disconnect the terminal.
Would adding an inline diode to the positive supply from the trailer to the battery solve this?
If so what size diode do I need?