Because the turn signals are a completely separate curcuit from the emergency 4 way lights. The turn signal wiring has a short that causes the fuse to blow out. In order to find that short, you need a technician that specialises in electrical wiring repairs, because you could spend days trying to find it and fail. It will cost some money but less than the value of the truck, or a traffic ticket for "no signals."
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Related Questions
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You may want to check the brake lights.Everything runs through the multi-function switch.(the turn signal switch)
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where are the flashers located
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