The red light will not come on, when the fuse is pulled, unless there is a demand for 12VDC. Try turning on and off one of the light switches with the fuse pulled. If the LED light comes on then the fuse is bad. Since it is in the slide I would like at the junction box outside under the slide. I believe on the rear end of the slide mounted to the frame. See if water and/or corrosion has taken its tole. If that is not the problem then you have to pull each 12 light and check for a loose wire. Let us know what you find.
Good luck.
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