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Its a bit of work but pulling wires and a visual inspection about the only remedy I can think of. They may work but if they chewed the insulation from a positive wire and negative wire next to each other, the wires can rub and cause a fire when jiggled underway. I was just given a "parts truck" (exact same model/yr as my 1993 Chevy) from a friend because his engine caught fire from rat/mice gnawing. If it is only an insulation compromise (where the is no loss of the wire itself which could also heat up) you can get some heavy duty heat shrink insulation. I would not put a butte connector in an area where there is no access.