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There is a fusible link under the hood, but this thing can pass a LOT of current. From what I've seen, the printed circuit board copper will probably vaporize or the solder melt off before the relay contacts go bad. They are not difficult to open and examine, they just sort of "squeeze and snap" together. I hope you didn't toss the old ones because they may be fixable if the current overdraw is the source of the problem.
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