[C320-list] trouble starting engine

[JPMESA at aol.com]

If the engine starts with the house battery's than it's probably a  bad 
connection somewhere with the starter battery. I'd check & clean all  connections 
on the starter battery especially the grounds . If you have a  voltmeter ( it's 
worth buying one) you can follow the wires and fine where you  are loosing 
the power. Maybe even at the battery switch.  JP