Originally Posted By: Virtus_Probi
Originally Posted By: Superflan
Originally Posted By: Virtus_Probi
Loudmouth off duty fireman tried to take over at the latter jump and was desperate to move the cable connection such that the batteries were directly in parallel...finally had to tell him to get his GD hands off my vehicle and that he was welcome to put his battery in parallel with the dead one as long as I was a ways away.
How do you connect cables?
Never directly across both sets of battery terminals, negative return goes to the chassis of the car doing the charging. SOP.
Jumping a battery is never really a great thing to have to do, but the extra resistance from the indirect ground connection helps keep current spiking down. Added safety measure that is simple to do.
My basic complaint is that I was being nice and giving somebody a jump and some jerk had to come bustling over to tell me how to do it the "right" way in rude fashion and try to grab things out of my hands...sorry, it's my car and I'm also an electrical engineer, so sod off.
I almost gave a random guy a ride a few weeks ago, saw him walking up the bottom of the road to the base lodge at my ski mountain and thought maybe he was employee with no ride. Slowed down and was going to ask him if he wanted a ride up when I noticed he had just lit up either a cig or a doobie...sorry, no smoke in my car, bye!
I believe it's also to keep any potential sparks away from the battery. The last connection will likely spark, and has a possibility of igniting the hydrogen gas from the battery. So the key point is to make the last connection on a bare chassis ground, away from the battery.
I haven't had a chance to stop and help a stranger, although, being in the city, I'm more wary of other issues.
Many years ago though, I was hopping on my bike about to head home from work. I saw a guy on a Honda Elite scooter that was having trouble starting. I asked if he needed help and he said that they can't be push started, and probably needed a jump. I happen to keep a pair of home made jumper cables for my bike (more for my bike than anyone else...). I had some 12 AWG wire with small alligator clips on both ends. I clipped onto my bike and his scooter started right now. I'd never used them, but I was glad to see that they worked. He even asked me about the cables to make a set for himself.
I've since built a nicer 10AWG set with flexible silicone insulation that I keep under my bike's seat.