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When the car has some electrical problems, it can be checked by yourself if the fuse is broken 1. Fog lamp is not on 2. Backup lamp is not on 3. Car headlight is not bright 4. Car horn is no sound 5. Car stereo is no sound 6. Car wiper does not scrape 7. Cigarette Lighter does not work 8. Air conditioning can't be opened 9. Sunroof can't be opened So, it's necessary to put a variety of fuse kit and tools box on the car. This link is Mini Size Fuse. It has 3 sizes: Medium, Small, Mini. Different car models need different sizes of fuse, Please measure your car original fuse size in advance (You can refer to the way in the picture ) According to the past experience ( For reference only ) Most US/Japan car brands need Small Fuse ( Toyota and Honda need Mini Fuse ) Most German/EU car brands need Medium Fuse ( Normally ,FAW-Volkswagen need Small Fuse ) Installing steps: 1. Disconnect Power Source 2. Select and remove a fuse in your vehicles fuse box with constant or switchable power capabilities that matches the power requirements of the accessory you are adding. 3. Insert new accessory fuse into added slot. 4. Install Add-a-Circuit with the newly added fuse installed , back into the fuse block. Reconnect power source, Turn on Ignition to test new accessory for proper operation . 5. If the accessory does not operate, turn the Add-A-Circuit 180 degrees and reinsert into the fuse block. Retest again .