Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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it sounds like the shop that did the welding did not remove the battery cables and when they welded, it fried the electrical system. it sends a high voltage up the ground side and causes all kinds of electrical problems.
you need to check all wiring from the battery cables to the firewall. I would start to assess the damage first before figuring out what needs to be replaced.
yes, the main battery cables from the battery. starter motor, alternator and all over under the hood.
how are you making out