Quote:
Originally Posted by Tfryman
You will get the same spark regardless of which terminal you connect/disconnect. The only reason the negative terminal is preferred is to minimize the amount of exposed positive metal which could accidently be shorted to any common metal surface by tools, etc.
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You are correct about the spark being the same on the + or - terminal. If something is drawing more than a minimal amount of amperage there will be a visitble arc during connecting or disconnecting. That is why it is advised when jump starting a vehicle to connect the negative (-) jumper cable last and to not connected to the battery.
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