First all - what do you mean "J -style" fuse? All cars I know use a small two pronged plastic enclosed fuse -
All fuses can be checked in several ways... 1. If it has a clear/colored case you can see the fuse element - it should be solid with no breaks, 2. If it doesn\'t have a clear case check it with a ohmmeter - it should read zero ohms, 3. If no ohmmeter... touch one terminal a small 9v battery to one end of the fuse and touch the other end of the fuse and the other terminal of the battery with your tongue at the same time... you should feel a small electrical charge. 4. Also... just change it with another fuse of the same value - most cars have more than one.
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