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Hi All,

I need to do some MIG welding on my '92 500SEL W140. I have a rust area below the right rear tail light that needs to be cut out.

Obviously I will disconnect the car's battery. Are there any other precautions I should take before welding - I don't want to fry any electronics.

Many thanks for any help.
 

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I haven't been welding my W221 yet but if you disconnect the battery, place the ground cable (of the MIG) close to the welding point and make sure the contact is good, and move wiring a bit away (you would have to do that because of the heat anyway), it should be completely safe.
 
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