lightning bolt indicator light on, next light below light bulb out indicator

I own a tow company, and I have a 05 jag VDP. I advise no one to jump another vehicle,especially with a jag, mercedes,BMW. See the car nor jumper cables do not regulate the amound of power that comes out.On a tow truck we have circut brakers for such reasons.Reserch explaines you can have complications,just of the jolting of ur battery,further you can blow fuses or ect, do to that.