TentCamper -
At the top rear of the toilet, there is a stand-up rectangular housing - the push-button flush switch is mounted on one end of it. At each end of the housing, there is a big Phillips head screw. Remove these two screws, and the housing lifts off. When it is off, you will see a fuseholder. Most of these toilets came with a 5-amp fuse installed. Over the years, Thetford found that this fuse tends to blow for no apparent reason, and they recommend that if it blows, you replace it with a 7 or 8 amp fuse. So that is what your spare fuse should be. I just leave a couple spares in a baggie right inside the housing, so I never lose them.
Bill
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