Had a chance to jumpstart a co-workers car tonight, but someone beat me to it. Then I realized I didn't know what battery to hook to on my truck. Does it matter whether using the driver side or passenger side battery to start someone elses car? I know about hooking up in the proper procedure to insure proper grounding, but what battery? What if my truck is dead and needs a jump? Which battery then? The owners manual was too generic to specify which battery to use. It was all about the safety stuff using remote battery starts.