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BradW Regular Location: Bottom of the hill, Sydney Registered: April 2004	Re: short circut? Tue, 04 January 2005 09:09 Cool1 wrote on Tue, 04 January 2005 18:06 The only reason for connecting the positive lead first is so that when you make the final connection, if a spark does happen it wont be near the flammable gases coming out of the battery! Are you saying that the cells near the negative terminal of the battery don't put out any gas or do you mean to connect the negative lead at the chassis as your final connection. Quote: I do however make sure there is plenty of fresh air passing the engine bay clearing any gases. Excellent advise when working with a battery that is being charged or has just come off the charger. Quote: If you connect the positive lead first, you may cause a spike to go directly to your ECU which will then blow its top and possibly other things along the way. How does this happen. Surely for a spike to occur from the battery being connected it needs to have a complete path back to where it came from. Therefore no current will flow from the battery unless both terminals are connected. So why is it different if you connect the positive first or last. Also a spike is caused by excessive voltage so how do you get this from a 12 volt battery. Voltage spikes while jump starting are a different story. These are caused when the flat battery is connected to a car that has the engine running. The alternator on the car that is running senses the extra load from the flat battery and increases its output which can cause the voltage to rise to a level which can damage electronics. This rise only occurs for a split second but is generally enough to fry things. When disconnecting a battery I always do the negative first. This way if you touch the body of the vehicle with your spanner you won't get a spark. When you come to disconnect the positive the circuit is cut so again if you short the terminal to the body with your spanner there won't be a spark. The reverse applies when reconnecting, positive first, negative last. Sorry for going way off topic and sounding like a prick. I'm not trying to start an argument, just clearing up what I believe to be wrong information. Brad [Report message to a moderator]

	Subject	Poster	Date
	short circut?	greenta22	Sun, 02 January 2005 23:20
	Re: short circut?	styler	Sun, 02 January 2005 23:35
	Re: short circut?	greenta22	Sun, 02 January 2005 23:42
	Re: short circut?	thechuckster	Mon, 03 January 2005 04:22
	Re: short circut?	Kyosho	Mon, 03 January 2005 05:39
	Re: short circut?	Cool1	Mon, 03 January 2005 09:44
	Re: short circut?	greenta22	Mon, 03 January 2005 08:43
	Re: short circut?	thechuckster	Mon, 03 January 2005 09:14
	Re: short circut?	greenta22	Mon, 03 January 2005 12:41
	Re: short circut?	styler	Tue, 04 January 2005 06:42
	Re: short circut?	Cool1	Tue, 04 January 2005 07:06
	Re: short circut?	BradW	Tue, 04 January 2005 09:09
	Re: short circut?	Cool1	Tue, 04 January 2005 09:20
	Re: short circut?	BradW	Tue, 04 January 2005 09:31
	Re: short circut?	Kyosho	Tue, 04 January 2005 09:41
	Re: short circut?	Cool1	Tue, 04 January 2005 09:46
	Re: short circut?	Cool1	Tue, 04 January 2005 09:48
	Re: short circut?	Cool1	Tue, 04 January 2005 09:45
	Re: short circut?	Kyosho	Tue, 04 January 2005 09:47

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