The load from the car battery would damage the charging circuit very quickly, I think they have a 1 amp fuse at best, any of my batteries accepts a minimum 5 amps at charging voltage any time of the day. For an emergency charger, I used to have an old 3hp briggs engine with a small alternator belt driven on a frame, that worked eally well if the batteries were only slightly discharged, start it up, go and have a bourbon (or coffee if your like that) and generally there was enough to start most things we owned on the farm.
Last edited by Joe Carroll; 01/02/14 09:57 PM.
