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Old 03-07-2020, 04:09 PM   #1
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Spare fuse?

I was looking over my 2018 Microlight 21DS, prepping for an upcoming trip. I took off the electrical panel cover to make sure all the connections were tight and everything looked good. However, when I removed the panel, there was a 15 amp blade fuse laying on the floor. I also noticed there is one empty fuse location at F11.

Is it a spare fuse or does it go in F11? Anyone know what F11 controls? I have a WFCO 8900 panel. The 21DS is still winterized and I didn't power it up to see what isn't working. I don't know how long the fuse was on the floor, but last year we didn't notice anything not working.
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Old 03-07-2020, 04:13 PM   #2
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I have yet to see the same model of any RV wired exactly the same. I'd just wait and see if everything works. If not, then you know where it goes.
If you really want more info, take the panel out and see if there is anything attached to that fuse slot.
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Old 03-07-2020, 04:15 PM   #3
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What does the fuse panel door sticker say? Should have all the fuse locations labeled.
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Old 03-07-2020, 04:17 PM   #4
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It takes a lot of time.....but on a crummy day, I pulled fuses to see what’s wired to what, and made my own legend to label things.
Several homes we bought apparently suffered the same problem of no one ever marking things down on the panel.
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Old 03-07-2020, 04:24 PM   #5
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On a WFCO power center the bottom two, #10 and #11 fuse positions are for higher current accessories (30 amp). On mine the tank heater was connected to #10 and #11 was empty (no fuse).

Is there a red light that stays on next to this fuse position? If not there's probably nothing connected to the terminal next to it. To make sure you'll need to remove the cover (two screws inside the access panel near the top) and just look to see if there's anything connected.

It's not unusual for a fuse to be left inside the power center if it's previously owned as the other owner may have had some issues and wanted to have a ready spare.

The 15 amp fuse wouldn't be for the tank heaters as they're most likely fused with a 30 amp fuse.

On my WFCO panel there is no fuse position #9. Merely a gap between #8 and #10 and a note that #10 and #11 are reserved for the higher current fuses.
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Old 03-07-2020, 04:26 PM   #6
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Quote:
Originally Posted by bikendan View Post
What does the fuse panel door sticker say? Should have all the fuse locations identified.
Assuming you can read the installer's shorthand
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Old 03-07-2020, 04:27 PM   #7
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Originally Posted by bikendan View Post
What does the fuse panel door sticker say? Should have all the fuse locations identified.
I checked the sticker but nothing is labeled. When I looked at the panel last Spring I don't remember seeing the fuse on the floor. All the other fuses are in tight. I'll have to power up the RV tomorrow and see if something's not working. Thanks everyone.
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Old 03-07-2020, 07:37 PM   #8
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Good idea to have a number of spare fuses. Harbor freight has them very reasonably priced. Good luck.
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Old 03-07-2020, 07:58 PM   #9
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Take the complete cover off and see if there are any wires installed for that fuse slot.
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Old 03-08-2020, 09:31 AM   #10
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Take the complete cover off and see if there are any wires installed for that fuse slot.
Good idea. I'll do that today and see if anything is connected. Thanks
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