I'm wiring my caravan into my car this weekend. In order to keep the caravan's leisure battery charged the cars alternator provides a current to the caravan for this purpose.
I need to figure out what gauge wire and fuse I need for this.
Unfortunately my multimeter can only measure up to 10amps DC and I don't want to kill it in the process of measuring the current from the car. I intend to let the leisure battery drop to 12v (about 50% full) at most. I think the voltage from the car is about 14.4v for charging the leisure battery, or around that.
I'm not sure how to calculate a current draw between two voltages.. I suppose a lot of it has to do with the fact these are lead acid batteries?
Some guidance would be very much appreciated. I couldn't find the answer on google.