Re: [alfa] Which battery lead - part 2.

["Gwynne W. Spencer" <gwynnes1@xxxxxxxxxxx>]

If the -  (ground) is still connected and your wrench on the positive 
terminal touches any part of the chassis / body you will have a direct and 
very dangerous short that could well injure you as well as ruin the battery 
and whatever part of the car the wrench touches.

Re the ECU being completely removed, just the lawyers scaring the 
manufacturers and them playing it safe.

Gwynne Spencer

At 05:33 PM 5/28/2004 +0200, you wrote:
>Hi All,
>
>In an attempt to get off the diesel thread here is the second part of the 
>question I posed
>a while back.  In part one I asked if anyone could give a definitive 
>reason why most
>publications recommend disconnecting the negative, i.e. the ground 
>connection, when
>isolating the vehicle wiring for maintenance purposes.
>
>In part two I take the subject matter a little deeper and pose a similar 
>question, but
>this time to do with when you have electric arc welding performed on your 
>vehicle.  As
>many exhaust shops today use a type of MIG or TIG welder to make neat 
>joints in exhausts
>etc it has always puzzled me that whenever I take my vehicles to such an 
>establishment
>they do not bother to disconnect the battery, or even ask if I have any 
>sensitive
>electronics onboard.
>
>So what is the reason to disconnect the battery?  Is it to protect the 
>electronics
>onboard, as certain manufacturers service manuals suggest.  Nissan posts a 
>big warning in
>their service manuals to disconnect the negative terminal when electric 
>arc welding is
>performed.  Certain others insist that ALL ECUs etc must be removed before 
>welding.  How
>is that some only require the battery negative to be disconnected where 
>others are adamant
>that the ECUs must be completely unplugged?
>
>Answers on a postcard to ------ ooops!  sorry been watching too many tv 
>quiz programs, to
>the list is fine.
>
>As John H says " Enjoys yours".
>
>John
>Durban
>South Africa
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