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Message: <blockquote data-quote="Petek" data-source="post: 632130" data-attributes="member: 9247"><p>i dont know how a muffler shop does it, but when i used to do semi trailer floor repairs with an alum mig, i had these clamps, one went to the positive, and one went to the negative and it protected the battery, and electrical system. i cant for the life of me remember what the heck it was called. but yes, welding can screw up stuff, like the ecu, and battery. we have had it happen at our shop, it destroyed some sensors in the refer system for a semi trailer, that's why we had to take precautions.  you may be able to weld on it with no problems, but there is possibilities of problems, it simply is not worth the risk.</p></blockquote><p></p>