Sparks from connecting negative terminal
#1
Sparks from connecting negative terminal
I disconnected my negative terminal to clear a CEL but when I was trying to put it back, it started to spark but I was able to put it on quick and that was fine. Why is this?
I also notice that it will only spark when the side edge will touch the terminal. It would spark and feel like its welding if I was to leave it. It left spark marks on the terminal.
I also notice that it will only spark when the side edge will touch the terminal. It would spark and feel like its welding if I was to leave it. It left spark marks on the terminal.
#7
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#8
+1 to the first reply.
Think of it this way: As your car sits (engine off) at any given time, it's consuming power from the battery (clock, ecu, alarm system, aftermarket stereo equipment, lights for any door or hood you may have opened, etc.) until the engine is running. This is why your battery will eventually go dead if you don't drive it often enough to keep it recharged. So anyway, just prior to connecting your battery terminal, all those circuits are enabled and ready to permit current flow the instant you complete the circuit. The arc that you see is the total current demand of all those circuits simultaneously powering up. This is normal. Just attach it quickly and don't fiddle around making and breaking the circuit over and over while you "settle" the terminal into place.
Remember, this is low voltage DC circuitry. Thus, there is a LOT of current flow required to make up the required power demands (since P=V*I, and V is fixed at 12v). In a pinch, you could quite literally weld metal with your little car battery; you're just seeing a very small sample of it and hence the light show.
Think of it this way: As your car sits (engine off) at any given time, it's consuming power from the battery (clock, ecu, alarm system, aftermarket stereo equipment, lights for any door or hood you may have opened, etc.) until the engine is running. This is why your battery will eventually go dead if you don't drive it often enough to keep it recharged. So anyway, just prior to connecting your battery terminal, all those circuits are enabled and ready to permit current flow the instant you complete the circuit. The arc that you see is the total current demand of all those circuits simultaneously powering up. This is normal. Just attach it quickly and don't fiddle around making and breaking the circuit over and over while you "settle" the terminal into place.
Remember, this is low voltage DC circuitry. Thus, there is a LOT of current flow required to make up the required power demands (since P=V*I, and V is fixed at 12v). In a pinch, you could quite literally weld metal with your little car battery; you're just seeing a very small sample of it and hence the light show.
#9
+1 to the first reply.
Think of it this way: As your car sits (engine off) at any given time, it's consuming power from the battery (clock, ecu, alarm system, aftermarket stereo equipment, lights for any door or hood you may have opened, etc.) until the engine is running. This is why your battery will eventually go dead if you don't drive it often enough to keep it recharged. So anyway, just prior to connecting your battery terminal, all those circuits are enabled and ready to permit current flow the instant you complete the circuit. The arc that you see is the total current demand of all those circuits simultaneously powering up. This is normal. Just attach it quickly and don't fiddle around making and breaking the circuit over and over while you "settle" the terminal into place.
Remember, this is low voltage DC circuitry. Thus, there is a LOT of current flow required to make up the required power demands (since P=V*I, and V is fixed at 12v). In a pinch, you could quite literally weld metal with your little car battery; you're just seeing a very small sample of it and hence the light show.
Think of it this way: As your car sits (engine off) at any given time, it's consuming power from the battery (clock, ecu, alarm system, aftermarket stereo equipment, lights for any door or hood you may have opened, etc.) until the engine is running. This is why your battery will eventually go dead if you don't drive it often enough to keep it recharged. So anyway, just prior to connecting your battery terminal, all those circuits are enabled and ready to permit current flow the instant you complete the circuit. The arc that you see is the total current demand of all those circuits simultaneously powering up. This is normal. Just attach it quickly and don't fiddle around making and breaking the circuit over and over while you "settle" the terminal into place.
Remember, this is low voltage DC circuitry. Thus, there is a LOT of current flow required to make up the required power demands (since P=V*I, and V is fixed at 12v). In a pinch, you could quite literally weld metal with your little car battery; you're just seeing a very small sample of it and hence the light show.
#10
Registered User
iTrader: (7)
i think you got it a little mixed up, its like bionic said negative off first to disconnect and connect if your planning to take both terminals off. The rule you might be confusing it with is that when connecting back then the positive goes first.
#13
yeah i'm late to the party here....yes this is normal, it's just how electricity works, no need for concern. keep in mind though that this is also why it's recommended to connect jumper cable grounds to the body of the car and not the battery. lead-acid batteries vent hydrogen as they discharge, increasing the possibility of an explosion from a spark. just a safety tip.
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esotericrider
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03-04-2019 07:53 PM