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Old 04-07-2013, 02:42 AM   #1
mister_eff
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Sparks when reconnecting battery

Hello,

I'm getting sparks when reconnecting the battery. I disconnect the battery by disconnecting ground first (at what I believe is called the left front strut tower, ie, not on the battery). Then disconnecting the positive terminal on the battery.

I reconnect by connecting the positive terminal on the battery. Then when I connect the ground terminal with the screw/stud thing, I get sparks. All doors are closed. I don't know what could be causing the sparks.

Am I disconnecting/reconnecting it right?

Also for some reason I'm having trouble tightening the screw/stud all the way. Like it gets stuck halfway through. I'll have to take a closer look in the morning, but I don't recall having any difficulty removing it.


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Old 04-07-2013, 04:57 AM   #2
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You need to disconnect the neg cable at the post on the battery. By unhooking at the strut tower you still have the ground cable to the block, so when you pull the pos cable you get a spark.
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Old 04-07-2013, 06:55 AM   #3
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+1 to above.

Disconnecting the negative from the battery is the best way to ensure the battery is no longer supplying any power to the vehicle.

As a side note though, even with everything "Off" on the vehicle, there are systems that continually draw some power from the battery (entertainment, keyless entry, various control modules, etc...). So, while it should not be a shower of sparks, one or two smaller but noticeable sparks when disconnecting the battery is not unusual and pretty common in my experience.

Best way to minimize is to try to maintain a solid connection while securing the clamp/post/bolt/etc...
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Old 04-08-2013, 12:57 PM   #4
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Ah, I see. Thanks for the replies. That worked! I'll disconnect the ground from the battery from now on.
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