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pooch · 01-04-2018, 02:13 AM

Is the battery hooked up correctly?

If the alternator is negative earth and the battery is hooked positive earth, I am sure that will cause a spark.

It blows the main fuse on modern cars if you hook up wrong.

01-04-2018, 02:13 AM	#16
pooch Senior Member Join Date: Sep 2010 Location: South Coast NSW Australia Posts: 2,596	Re: Why does this wire Spark? Is the battery hooked up correctly? If the alternator is negative earth and the battery is hooked positive earth, I am sure that will cause a spark. It blows the main fuse on modern cars if you hook up wrong.