well i put the switch in and didn't start.. jump it at the starter and firer up... check the volts at the battery while runnig and it was 14.86 here's a funny question. my 2006 nissan frontier battery with no key on reads 12.52 volts, now when the meredes is off it reads 13.87 volts. is my mercedes battery wasted?????? also when i keep the charger on it seems to fire up more consitant.. i do have a clue on this.... o' well, i'll see the dealship when i can.. nearest one is 200 miles......... love the car anyway......