Went to Autozone yesterday and talked to one of the big guys and he said that first of all never connect + to - you will blow your system, second that I need to find out if those batteries are connected to the engine I.E. alternator or they will have to put on a charger, I asked him if the 110 hookup charges them and he said no, he also said that if the one battery is at 14 volts it could be a dead cell? He said I could bring the motorhome by and they would check to see if the series batteries are connect to the alternator, I figure the only way to do that is trace the cables back and see if they reach the alternator, my back is acting up so I probably won't be able to do that myself, any thoughts?
Thanks