Originally Posted by doublevan2
So this 2002 E350 I have has the option to start the chassis/engine from the house battery. None of my previous vans had this option. I'd like to "test" this option out before traveling.
If chassis batt is fully charging and good to go - would I damage the chassis batt/system by pushing the house batt/button to start ?
On most older builds all that does is parallel the house battery to the starting battery. So no it will not hurt. What is important to know is most of these setups are intended to assist the starting battery. Unless you know the size bus wire that links the two batteries is large enough, an undersized bus can get pretty hot when cranking the engine if the starting battery is very low or dead. Just like using jumper cables, sometimes you have to leave the cables connected for a bit to help the starting battery regain some of its charge before attempting to start the engine. Not sure about your relays.