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welding a car?

need to weld an exhaust bracket on the wifes 08 focus. been 20 years since i welded a car and i used to disconnect the battery and alternator. what do mechanics do now ? (ie with engine management unit etc)
simon, June 2013
if you are mig/electric welding it would be safer to disconnect the battery

cdc, June 2013
link Click here to see other fixes for Focus.