I am leaning toward the fuse link. They can break or burn inside the insulation and not be seen. Sometimes the broken wires inside the insulation will touch making contact and even arcing themselves together, but a small electrical load or even a bump in the road can make them separate again. If you don't see any burn or open on the fuse link, you may try pulling on them. If they are bad they will stretch like a rubber band. If good it will feel like pulling on a regular piece of wire.
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