I'm adding a battery to my cargo trailer for the electric jack I plan to install. Will the plug from the truck charge the battery? I already have a battery for the electric brakes, I'm not sure if it's getting charged since it's for break away emergecies. Look for some input, thanks.

 

the 12vt wire will only trickel charge the battery wile hooked up to the truck .it will not eliminate having to charge the battery up seperatly .if you want to give it a heaver charge when hooked up you will have to run a heaver cable to the back probably 1/0 with a battery iosolater and probably a higher amp alternator .this wont be cheap !