What other than the fuse could be causing my rear brake and signal lights from working? The signals when turned on blink rapidly on the dash.

Asked by Sep 02, 2015 at 07:18 PM about the 2005 Ford F-150 XL SuperCab 4WD

Question type: Maintenance & Repair

I've checked the 20 amp fuse its fine and replaced it anyway.  When I plug my trailer in the lights work on the trailer but still no signal or brake on the rear of the truck.

5 Answers


did you check the bulbs

yah the bulbs are good. I was thinking possibly the flasher relay


The rapid pulsing of the dash indication is read by the vehicle as a burnt out bulb. With a mult-meter probe the connections inside the socket with the signals on and make sure you are getting voltage to the sockets. Usually power is supplied to one side of the lights with a jumper being connected to the other side. If there is a break or bad socket it will cause your problem. Usually a bad flasher will result in the light coming on, but not flashing, but it could cause the problem you are experiencing.

1 of 1 people found this helpful.

i think you might have one of the bulbs bad inside are any lights on the car brighter than the others. if so it could be shorted inside the bulb it can back feed


did you find your problem

Your Answer

Add photo

Related Questions


Looking for a Used F-150 in your area?

CarGurus has 206,316 nationwide F-150 listings starting at $1,499.


Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
Reputation 7,930
#2 dandyoun
Reputation 4,360
#3 tennisshoes
Reputation 2,760
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,718 Great Deals out of 175,751 listings starting at $1,250
Used GMC Sierra 1500
822 Great Deals out of 68,199 listings starting at $2,484
Used Dodge Ram 1500
453 Great Deals out of 11,151 listings starting at $700
Used Ford F-250 Super Duty
346 Great Deals out of 46,938 listings starting at $1,895
Used Toyota Tundra
443 Great Deals out of 34,312 listings starting at $2,700
Used Toyota Tacoma
544 Great Deals out of 40,814 listings starting at $2,495
Used Ford Mustang
472 Great Deals out of 45,735 listings starting at $1,999
Used Nissan Titan
170 Great Deals out of 19,555 listings starting at $3,000
Used Chevrolet Colorado
217 Great Deals out of 24,313 listings starting at $2,495
Used Ford Explorer
944 Great Deals out of 72,519 listings starting at $1,000
Used Chevrolet Tahoe
550 Great Deals out of 29,235 listings starting at $1,699
Used Ford Ranger
197 Great Deals out of 5,805 listings starting at $1,650
Used Jeep Wrangler
277 Great Deals out of 18,163 listings starting at $2,950

Used Cars For Sale

2017 Ford F-150 XL SuperCab 4WD For Sale
4,534 listings starting at $25,997
2016 Ford F-150 XL SuperCab 4WD For Sale
244 listings starting at $24,585
2015 Ford F-150 XL SuperCab 4WD For Sale
168 listings starting at $21,283
2014 Ford F-150 XL SuperCab 4WD For Sale
5 Great Deals out of 95 listings starting at $14,000

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.