I would like to mount some external flood-lights on a motorhome with a 12V DC system. I may need to install new positive wires to make sure they are sufficiently thick.
I wonder if I also need to install thicker negative wires, or if I can simply connect to the existing negative wires, without worrying that I overload them?
Someone told me that the negative wire in a 12V DC system can be very thin, but I haven't been able to find any information on this.
Is this complete nonsense and should the negative and positive wires be the same gauge? Or can the negative wire be thinner than the positive wire by some ratio?
If possible, please give a reference for your answer.
Thanks!