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Posted by SteveB on August 4, 2008, 2:12 am
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My SIL is a good guy and treats my daughter good. He can't back a trailer
for crap, though. He put two nice dings in my truck so far, and I've had to
repair two trailers.
He comes to me with his Yukon Denali. It has a small 4" x 4" plate where
the plug plugs in that has somehow (?) been ripped off the bumper right
along the original MIG welds.
No problem, sez I. Sez he, "Aren't you going to disconnect the battery so
it doesn't foul up the computer?" I really don't think it's going to put
any electricity into the system, and it's not welding near any computer type
component, so I sez no. But, I tell him I'll check with the pros.
I've heard to disconnect the battery, and not to disconnect. When is it (is
it) appropriate to disconnect?
Steve
--
"...the man who really counts in the world is the doer, not the mere
critic-the man who actually does the work, even if roughly and imperfectly,
not the man who only talks or writes about how it ought to be done."
Theodore Roosevelt 1891
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Posted by Doug Miller on August 4, 2008, 7:43 am
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wrote:
>My SIL is a good guy and treats my daughter good. He can't back a trailer
>for crap, though. He put two nice dings in my truck so far, and I've had to
>repair two trailers.
>
>He comes to me with his Yukon Denali. It has a small 4" x 4" plate where
>the plug plugs in that has somehow (?) been ripped off the bumper right
>along the original MIG welds.
>
>No problem, sez I. Sez he, "Aren't you going to disconnect the battery so
>it doesn't foul up the computer?" I really don't think it's going to put
>any electricity into the system, and it's not welding near any computer type
>component, so I sez no. But, I tell him I'll check with the pros.
>
>I've heard to disconnect the battery, and not to disconnect. When is it (is
>it) appropriate to disconnect?
Why take a chance?
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Posted by Joe Pfeiffer on August 4, 2008, 11:18 am
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> My SIL is a good guy and treats my daughter good. He can't back a trailer
> for crap, though. He put two nice dings in my truck so far, and I've had to
> repair two trailers.
>
> He comes to me with his Yukon Denali. It has a small 4" x 4" plate where
> the plug plugs in that has somehow (?) been ripped off the bumper right
> along the original MIG welds.
>
> No problem, sez I. Sez he, "Aren't you going to disconnect the battery so
> it doesn't foul up the computer?" I really don't think it's going to put
> any electricity into the system, and it's not welding near any computer type
> component, so I sez no. But, I tell him I'll check with the pros.
>
> I've heard to disconnect the battery, and not to disconnect. When is it (is
> it) appropriate to disconnect?
I've heard anecdotal stories from people claiming that somehow welding
on a vehicle without disconnecting the battery caused computer
problems. If somebody would come up with a plausible explanation for
how this is possible (even if only for a particular process, like
TIG), when the ignition system doesn't do it, I'd love to hear it.
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Posted by Curt Welch on August 4, 2008, 12:21 pm
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> > My SIL is a good guy and treats my daughter good. He can't back a
> > trailer for crap, though. He put two nice dings in my truck so far,
> > and I've had to repair two trailers.
> >
> > He comes to me with his Yukon Denali. It has a small 4" x 4" plate
> > where the plug plugs in that has somehow (?) been ripped off the bumper
> > right along the original MIG welds.
> >
> > No problem, sez I. Sez he, "Aren't you going to disconnect the battery
> > so it doesn't foul up the computer?" I really don't think it's going
> > to put any electricity into the system, and it's not welding near any
> > computer type component, so I sez no. But, I tell him I'll check with
> > the pros.
> >
> > I've heard to disconnect the battery, and not to disconnect. When is
> > it (is it) appropriate to disconnect?
>
> I've heard anecdotal stories from people claiming that somehow welding
> on a vehicle without disconnecting the battery caused computer
> problems. If somebody would come up with a plausible explanation for
> how this is possible (even if only for a particular process, like
> TIG), when the ignition system doesn't do it, I'd love to hear it.
I've seen that as well and can't figure out why that would be true.
It seems to me that keeping the battery connected is more likely to protect
all the electronics in the car than harm them while welding. It acts as a
voltage regulator so in case there are any currents induced in any of the
wires, it's more likely to clamp the voltage levels to 12V instead of
allowing them to rise to higher levels that could do some harm. The only
thing I would expect to be protected by disconnecting the battery is the
battery.
--
Curt Welch http://CurtWelch.Com/
curt@kcwc.com http://NewsReader.Com/
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Posted by Leo Lichtman on August 4, 2008, 2:22 pm
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"Curt Welch" wrote: (clip) It seems to me that keeping the battery
connected is more likely to protect
> all the electronics in the car than harm them while welding. It acts as a
> voltage regulator so in case there are any currents induced in any of the
> wires, it's more likely to clamp the voltage levels to 12V instead of
> allowing them to rise to higher levels that could do some harm.
^^^^^^^^^^^^^^^^^^^^^
Actually, following that logic, you should turn everything on--radio,
ignition, lights, global navigator, etc. Otherwise, the 12v clamp isn't
there.
^^^^^^^^^^^^^^^^^^^^
The only thing I would expect to be protected by disconnecting the battery
is the battery.
^^^^^^^^^^^^^^^^^^^^
And it will carry more current without harm than most welders will put out.
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>for crap, though. He put two nice dings in my truck so far, and I've had to
>repair two trailers.
>
>He comes to me with his Yukon Denali. It has a small 4" x 4" plate where
>the plug plugs in that has somehow (?) been ripped off the bumper right
>along the original MIG welds.
>
>No problem, sez I. Sez he, "Aren't you going to disconnect the battery so
>it doesn't foul up the computer?" I really don't think it's going to put
>any electricity into the system, and it's not welding near any computer type
>component, so I sez no. But, I tell him I'll check with the pros.
>
>I've heard to disconnect the battery, and not to disconnect. When is it (is
>it) appropriate to disconnect?