Gimmeagig wrote
I was told that LEDs available for that truck are not dimmable and that the turn signal LEDs would require a different blinker relay and a separate ground wire.
Can’t say for all LED brands, but I installed the same as Gary, HI-PO ones.
They are dimmable, although if I dim very low, they tend to “pulse” (in my case). Not a big issue, I love them.
I tried them for the indicators too (brake, 4x4, flashers, high beams) but put back regular bulbs there: I found that LED are much too bright for that use.
I confirm that HI-PO were flashing normally as turn signal, and had also two levels as high-low beams indicator, just as regular bulbs do.
LEDs are electronic parts, the way they are built is important, so maybe your NAPA guys are right about the limitation of the brands they are listed for.
Jeff / 1984 F350 Crew Cab 4x4/5.8L w351 4V/ T18/ D50 4.10 front/ 8' bed.
Restored 2019-2022.
Nicknamed «Big Brother 1984», due to its soooo-looong shape & nod to George Orwell's 1984 famous novel.