I've jump started hundreds, if not thousands of vehicles, and never had a problem. I'm a contractor, and I've used my old 96 f150 to jump start more heavy equipment than I could even begin to count- Forklifts, backhoes, dozers, skidsteers, generators, ect. However, I recently bought a 2001 F350, and yesterday, it seems that I toasted the alternator while jump starting my old F150. Since I'd rather avoid this in the future, and because with my line of work, using my work truck to jump equipment is a fact of life, I'm wondering if someone makes some sort of surge protector designed to protect the charging system on the vehicle providing the juice? I have a 300amp jumpstarter that runs on 110v that I use if I have power, but that's not always an option, and considering the size of the equipment I'm often jumping, and the fact that starting the engine from cold often requires extended cranking, a little battery powered jumpstarter pack isn't going to do the job. I always used a set of fairly light 4-6 gauge? jumper cables with my F150, but when I bought my F350, I gave my old cables to my girlfriend for her car and bought a set of 2 gauge cables (the heaviest duty cables they had at the parts store).