betty2017
Member
What would happen if we connect the positive and negative poles together?
What would happen?
- Thread starter betty2017
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Monster5601
Platinum Member
If the device pictured doesn't have output current limiting, is not able to detect a short, and depending on its charge state, the jumper cable wires will have a very short life as will the device.
k0ua
Epic Contributor
For a really fun time connect a telephone central offices -48 volt power buss to ground before the main fusible link. Yes, large copper buss bars can and will turn white hot, melt and fall onto the floor.
EddieWalker
Epic Contributor
A friend in high school hooked up the jumper cables backwards on a car battery once and it exploded on him. I accidentally touched a wrench to both polls on a battery while taking off a cable and it melted a bit of the wrench off in about a second.
Xfaxman
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Nothing according to their Website: http://www.genstattu.com/tattu-400a-12v-12000mah-jump-starter-power-bank-battery-charger-led.html
mrmikey
Veteran Member
I was under a tandem truck removing the starter, being a duma$$ or lazya$$, take you choice, I shorted the battery wire to ground, burnt my hand a bit and soiled the shorts and wrote the wrench........Mike
I had a friend that after starting on his second six pack touched the positive and negatives together on a truck to see what would happen. After he got out of the hospital people referred to him as one eye.
CobyRupert
Super Member
This is equivalent to touching a wrench to the frame and the positive (+) pole of the battery if the battery's negative pole is connected. (Assuming a modern (post-1960 12V) negative ground system)
We should all remember that this is why you should disconnect the negative post first when removing a battery, and connect it up last when installing a battery. That way there is no short circuit path from the + terminal to the - terminal of the battery through the frame, and you won't melt your wrench if you touch the frame when putting on or taking off the +terminal.
^It seems backwards to disconnect the "ground" before the hot (opposite doing work on your household AC circuit), but.....
fidowanttobe
Platinum Member
Positive cable "welded" a hole through a brand new header one time as we were so excited to fire the new engine for the first time no one noticed the cable resting against it.
