I blew a trailer-related fuse somehow on my 2017 F150 supercrew XLT. The picture is the one. It's a 25A and it has a number on the side. I googled it and got nada. 5K2181 on the side. Where on Earth?

 

Try this
https://www.delcity.net/store/Fuses-&-Fuse-Taps/p_182

Or read more on this link
https://www.fordraptorforum.com/thre...-know-it.7417/

 

...

 

Oreilly's should have them. I managed to blow a couple of those due to a bad 7 pin and got them at Oreilly's

 

It looks a lot like a MCASE fuse. However, there are several different types of fuses that look very similar with only slight differences in the casing. I found this out the hard way with my 2013 which uses yet a different but similar style of fuse. Try the dealer. I expected them to be expensive but it was surprisingly cheap--less than a buck a piece.

 

Thanks,

I'll give O'reilly a try this morning. If no luck I'll have to stop at the dealership. Hopefully my local stealerships are reasonable but I've never been able to buy anything, even at MSRP. They like to gouge on everything. Often they'll quote an outrageous price like $50 for some part that has an MSRP of $20 and then "cut me a deal" for $35 or something like that. That is precisely what my two closest dealerships did on OEM touch up paint. I ended up buying it for $14 shipped online (OEM). I don't mind them making a profit but they are always outrageous.

 

O'Reilly's, Autozone, Advanced Auto carries them

I had the same issue happen when my trailer kept having grounding issues on the lights.

You can buy them in bulk online as well. :-)