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You'll need to isolate the individual components and different branches of the wiring. With everything turned off or unplugged, use a meter across the fuse and find out if there is a short to ground. If there is, follow the wiring through to find the short. You'll have to find the individual connections and wiring branches. To do that, you'll need a wiring diagram. That kind of problem is frustrating and tedious to solve, but with a little effort and dedication and some natural ability, you can certainly solve the problem.

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Q: How to find the problem with 97 Chevy Blazer S10 20 amp courtesy fuse blowing which controls horn and rear wiper and interior lights and electric mirrors?
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