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Fuses blow because there is too much current. This is typically caused by a short circuit, but it can also be caused by too much load, perhaps from adding extra lights. It is also possible that corrosion on the fuse connector can cause heat, which would also tend to blow the fuse.

Check each of the light assemblies and make sure the bulbs are OK and that the wiring is not crimped, cut, or corroded. Sometimes, a wiring harness may go around the edge of a piece of metal and the insulation gets cut, causing a short circuit. It is also possible that the turn signal switch is bad.

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Q: What causes turn signal fuse to blow on 1995 Chevy G20 van?
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