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Zeke's Avatar
 
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Can you think of what else to unplug before welding?

DME, DME relay, wires to coil, three sensors.
How 'bout the plug(s) at the rear relay board?
Where is the speedo pick up?

Old 09-29-2007, 11:19 AM
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Milt, our rule is anything that pertains to charging system and ignition. So Battery (at least the ground), alternator, coil, distributor, dme, etc.
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Old 09-29-2007, 11:27 AM
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OK, I didn't forget the battery here, just on my post.

Any way to disconnect the alt externally?

On second thought, I'm welding on the muffler. I think I'll remove the muffler instead.
Old 09-29-2007, 11:30 AM
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...waiting for the PB Blaster to do its magic.

Anyway, this stuff is good to know. This ol' '88 is a lot more complicated electrically and electronically than my '71.
Old 09-29-2007, 11:56 AM
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Milt,

Factory alarm module is famous for dying at the paint & body shop, and rendering the car un-startable!
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Old 09-29-2007, 04:28 PM
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Quote:
Originally Posted by Early_S_Man View Post
Milt,

Factory alarm module is famous for dying at the paint & body shop, and rendering the car un-startable!
Ouch. Glad I just removed the muffler instead. And, I found the hanger was broken, so I got a little extra repair in.

Gonna take a ride tomorrow!.

Thanks, Warren.
Old 09-29-2007, 05:58 PM
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Yet another convincing argument to go with carburetors.
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Old 09-29-2007, 06:30 PM
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Yet another convincing argument to go with carburetors.
Not really. You still have the 14 pin connector, the dizzy (especially the tach lead on early cars), the battery, the CDI and maybe some more. All these cars are different.
But the later ones can get harmed easily, IMO
Old 09-29-2007, 07:58 PM
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Wouldn't proper grounding take care of any non-computer issues?
I've been welding on my car for years with no problems.
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Old 09-29-2007, 08:07 PM
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I've done quite a bit of welding on my '85 and other than disconnecting my battery I've done nothing special. Never had a problem as a result. Luck perhaps?
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Old 09-29-2007, 08:16 PM
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I have welded on lots of cars - call me crazy - but never unplugged anything and never a problem. I just put the ground clamp directly on the part I was welding which was almost always something on the exhaust system. Some of those cars had some very sophisticated electronics.
Old 09-29-2007, 08:34 PM
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I have taken my cars to exhaust shop many times. As BertBeagle said, they never unplug anything even when I requested to unplug the batery neg cable.
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Old 09-29-2007, 09:07 PM
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Well, I guess there are two sides to a story. But, if something goes wrong, or you touch something you shouldn't in the darkness of the helmet, then it could be a problem. Someone recently blew their CDI (actually an MSD unit) by just touching and grounding the battery cable at the starter.
Old 09-30-2007, 10:53 AM
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It's always good to be extra careful isn't it.
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Old 09-30-2007, 12:11 PM
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Quote:
Originally Posted by BertBeagle View Post
I have welded on lots of cars - call me crazy - but never unplugged anything and never a problem. I just put the ground clamp directly on the part I was welding which was almost always something on the exhaust system. Some of those cars had some very sophisticated electronics.
Clamp the welding ground cable close to the weld area (to ground). Since electric welding is a form of resistance welding (the welding tip creating the air gap resistance), the closer the ground clamp to the weld area, the shorter the current path. That's why welding a muffler is pretty safe and welding close to an ECU isn't. It's still a good idea to disconnect the ground cable, just in case.

Sherwood

Old 09-30-2007, 03:03 PM
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