Issue while switching to LED lights

[RadRik]

I switched most of my incandescent lights (1141 12 volt) with LED's. While changing a bulb an overhead fixture the lights flickered and went dim, but not out. I tried putting the original bulbs back in, but it made no difference. It affected all the lights in the 2 living room slides, but no other lights. The lights work in other fixtures and all the fuses are ok. I'm not sure how to proceed troubleshooting this. I think I should take the light I was working on apart and see if something went wrong in it, but why would it affect 2 other light fixtures?
I have a 2012 Wildcat Sterling 32RL

[Canonman]

Could be a loose connector. One light may be "daisy chained" to the next and connector may have become loose likely just behind the fixture you were working on. Definitely needs to be checked. If you know your way around a VOM then use that to check the voltage at the bulb connector if it seems OK wiggle the connector a little. A loose or bad connection will cause the meter to fluctuate good to bad etc. Manufacturers are using friction type connectors and these sometimes fail to hold properly.

[RadRik]

Thanks Canonman, I will check into that this morning. Hopefully it will be a simple fix.

[RadRik]

Problem found. I was trying to put the wrong bulb in the light fixture. The base was different and caused the fuse to blow. Not sure why the lights dimmed at first and stayed dim. I pulled the wrong fuse at first. It's amazing how well things go in the daylight.

[Telstar]

might be a bad connection in the wiring behind the fixture. Drop the fixture and take a look.

[Canonman]

Glad you found the root of the problem and the fix was a simple one.
As I always say, better lucky than good!
Happy camping