[Spridgets] Battery disconnect

[Paul Herder]

Also you mention that with the battery disconnected WITH the engine running, the alternator (or generator) will supply the power to keep everything running!

 

That is why racing organizations require that the disconnect switch actually will kill the engine (wired wrong, the battery will be disconnected but the engine will still run… a real safety hazard in a racing accident!)

 

Paul

 

From: Spridgets [mailto:spridgets-bounces at autox.team.net] On Behalf Of John Innis via Spridgets
Sent: Wednesday, January 13, 2016 11:52 AM
To: MICHAEL ROWE
Cc: Spridgets
Subject: Re: [Spridgets] Battery disconnect

 

It really doesn't make a lot of difference which one is disconnected, either will prevent any danger of a short.  But there is a good reason to do the negative, or at least do it first.  The reason is that if your wrench accidentally hits a part of the body or frame while removing the negative terminal, it is not a problem because they are normally connected to the negative terminal anyway.  But, if your wrench slips while undoing the positive terminal and hits the body or frame, you are arc welding.  Once the negative is disconnected, there is no path for current back to the battery, so the risk is eliminated. 

 

On Wed, Jan 13, 2016 at 11:44 AM, MICHAEL ROWE via Spridgets <spridgets at autox.team.net> wrote:

Instructions for working on the gauges of my Toyota say remove the negative battery terminal.  This makes no sense to me.  It leaves all the hot wires live, so if your tool grounds one of them, it will spark.  Removing the positive terminal eliminates this possibility.

 

Some years ago, I put in a kill switch on the ground terminal, and the car would continue to run when the ground was open.  It only prevented starting.  In fact, this is one of the electrical tests mentioned by John Twist.  

 

All of my cars have a disconnect knob on the positive terminal.  Do I have this backward?

Michael Rowe


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