tazmanken

I just bought a 2015 F150 XLT and the book says it has a 921 back up bulb,after looking around all the 921 bulbs I can find have the small white plug on them like the white lights on the back of the cab and lic plate lights,my back up bulb has the wider black end on it like the 3156,so did Ford put the wrong number in my book? Thanks Ken


Took me a while but I found another thread listing all the bulb numbers, Mine is listed wrong in my owners manual.

jcat

ever make any progress with this? Thinking of changing reverse, plates and Cargos to LED but unsure if the can-bus is picky or not.

tazmanken

I put LED bulbs in my cargo,back up and license plate and no issues at all,I ordered the front parking/turn signal led bulbs and tail/brake/turn signal led bulbs.not sure if I will need resistors yet or not,I already have some so if I need them I can hook them up. Wish it would work like my 2015 Harley Trike,I put led tail lights and led front turn signal/parking led's on it and it flashed fast so all I had to do to fix it was turn the 4 way flashers on for a few seconds turn them off and the turn signals flashed great after that.

svt2205

Looks like the Sylvania auto replacement guide lists 3156 vs the 921 in the manual. Sounds like Ford hasn't caught their mistake in the owners guide yet.

jcat

For any flashing light on these trucks you're gonna need resistors, no way around it. Unless you can find a replacement plug-and-play relay that works with the lower draw of the LEDs.

tazmanken

I was told the same thing on my 2013 Ford Edge and it never needed any resistors on it,but its no big deal if I have to put them on my truck,already have them and it only takes a min to install them.
I thought the LED tailgate light bar would have caused a issue after tying it into the tail lights and turn signals but it didn't.

hosseface

They are 3156. I just changed mine.

Sylvania has FINALLY came out with a 3156/3157 (same thing - 3157 will work for a 3156 but not vice versa). I just bought them and they are GREAT!!

http://shop.advanceautoparts.com/p/s...bp2/10998324-P

Super bright.

The cargo/3rds are 921, brakes are 3157. I changed them all out to LED. Sylvania doesnt offer a 921 LED so I used Philips, they are great as well. No Chinese/ebay/VLEDs garbage for me.

tazmanken

Well I put the rear LED turn signal bulbs in my truck and did NOT need any resistors,Turn signals flash normal. woohoo this makes 2 different vehicles now I was told I would have to put resistors on and didn't, maybe Im just lucky I dont know.

02fx4dude

As far as I can tell, all exterior lights are controlled by the body control module, unfortunately. No flasher relay that can be swapped for an LED compatible version. It would be great if it could be taught like the TSS modules like with the Harley Davidson's. I put LED's in my front and rear TS and needed resistors. The actual signals flashed at the correct rate but on the cluster the TS arrows flashed fast.

tazmanken

When I put it reverse the screen on the dash was really bright and I could see really far away just looking at the screen lol