bigm740

So the stupidest thing I ever did this morning was ask someone to jump start my car with another fully charged battery. not paying close attention to the molded + and - symbols, the charged battery's +ve went to the car's -ve, and -ve went to the car's +ve (discharged battery in its place, connected)... the person doing it saw a huge spark before I attempted to switch on the ignition. the wrong connection was on for about 15-20 seconds before i rushed to the rear free off the clips.

After connecting it properly, the cluster/lights/seats would all work properly, car ticks for about 6 secs but won't fire up. Am I gonna be dealing with a fried ECU/alternator here or do you think my fuses saved it ? And how do i tell ? (my OB91 Scanner displays no fault)

Thanks a lot for any input !

shardul

iTrader: (1)

The jumper battery is not strong enough to crank the car. Get a jumper box and the car will start right up.

bigm740

thanks for the advice shardul. the smallest jumper box where i am is 750 amps. isn't that way too much current for a car like that ? and is there a way to tell how severe the damage was due to the wrong cabling ? I'm just waiting till monday to tow it to the dealer.

tusabes

The rating on the jumper box is a max rating they do not really make 750amps

s5benzo

be careful jump starting your car, w220's dont like to be jump started , if your battery is dead try to just replace it . jump starting these cars can fry some electronics if not done cautiously and safely. goodluck