Maybe a short in the switch?
2005 F-150 Lariat [Current]
I survived the 5.4L spark plug change and didn't break any!
Gibson stainless performance headers. Flowmaster 40 dual-out muffler. SCT X4 + 5star performance tune.
I have the delightful benefit of being an unpaid staff member, and as such, I am 100% unbiased.