Can welding screw up the electronics on an ATV?

Just picked up a little '06 250ex to screw around the yard with and was going to weld a few tabs on the frame to install some armor. Do you guys think I should go thru and make sure any grounded wires are disconnected before welding? I am afraid I might ruin the CDI or I being over cautious?

Always disconnect the negative terminal on the battery and you should be good to go.

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