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Are you using any of those power outlets to run a accessory? A lot of times it is the accessory causing it to blow.
If you have several outlets, unplug one at a time and check if the fuse blows again. You may have a outlet shorting also.
Hope this can help. Let me know.......
I use only One of the outlets, which Is for a cellphone charger.. other than that, i don't use the others but on vacation trips (2x's a yr) for the DVD player..
I have seen a lot of cell phone chargers blow the fuse. It is caused by poor contact in the outlet socket. I have cleaned them out and bent the tabs on the charger connector to help get a good contact.