How to Fix a Box Fan. If there isn’t, check to see if the appropriate fuse has blown. Check the labeled area that corresponds to the part of the house that lost power. You may also need to get out a multi tester for your fuses to check the rest. Now, you need to locate the blown fuse. Engine compartment. The motors and bearings on box fans have a tendency to go bad. Turn off the main power switch to disconnect power to the fuse box. It's called a fan isolator. I can't find an obvious "JCASE fuse puller", or any "JCASE fuse tester" at all. Blown fuse. If the appliance has a plug, unplug the power cord. These are put in so that the fan can be switched off without having to turn the entire lighting circuit off.Inside there is a permanent live, used for the timer function, a switched live connected to the light and a neutral. Normal fuse 2. That's your broken fuse. Check the cord and the inside of your fan for this fuse. Type F. 1. After a fuse is replaced • If the lights do not turn on even after the fuse has been replaced, a bulb may need replacement. Testing a ceramic fuse is the only way to tell if the fuse has blown. 5. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located). Here is how to fix a box fan. Multimeters read both volts and ohms. 2. The motors and bearings on box fans have a tendency to go bad. A blown fuse may be discolored, cloudy, or have a melted or broken metal piece inside. I can't find any information on how these fuses are tested, or what the best way to remove them is. Look to see if there are circuits that are connected. You will be able to tell which fuses are broken by simply holding them up to the light. The fuse is generally behind the face plate along with the wiring and back-up battery. If you discover that the fuse has blown, you’ll need to order a replacement to get your fan working again. With the main power still off, unscrew the blown fuse and remove it. Box fans work by having a set of fan blades attached on the shaft of a small motor. Driver’s side instrument panel. Contact your Toyota dealer. The fuses should be easy to spot inside of your fan. The box you are describing does not contain a fuse. Step 2 Set an ohmmeter or multimeter dial to zero. FOR A FUSE BOX: If your electrical panel has fuses, check each fuse to see if the piece of metal inside has melted, or if the glass window at the top of the fuse has become discolored (usually purple or brown). This allows the MDL fuse to resist higher amperes for very brief moments, such as a high-draw from a compressor or fan … Unscrew the broken fuse and replace it with a new fuse that is the exact same size, type and amperage of the broken fuse. It's filled with rows of typical blade fuses, and also filled with the colorful little boxes called a "Low Profile JCASE fuse". Then, unscrew the panel from the breaker box and turn on a digital multimeter, which is a small device used for testing voltage that you can find at your local hardware store. To tell if a circuit breaker is bad, start by unplugging or turning off all devices that are connected to the breaker. Fuse layout and amperage ratings. 2 Remove the fuse by grasping it between the thumb and index finger and pulling until it comes free. The amperage rating can be found on the fuse box lid. You will simply then need to replace the old fuses with the new ones. 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