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Hello All First post here, flat bed lights wiring, need some knowledge please
Hello, my name is Joe, this is my first post. I have a 2014 Ford F350 Gasoline. The previous owner took the bed off and had a flat bed put on. Once I purchased the truck I had to wire all the lights on the bed.
It has your traditional flat bed oval lights, 4 on each side, all of which are running lights, brake and turn signals . It also has the small circle lights at the front and rear of the bed on the sides 4 in total, and 5 more small circle lights on the rear, which are just running lights.
i tested the wires at the fatcory plug at the rear of the truck and labeled all so that i can splice the correct wires to the correct lights.
So all lights are installed, wired and work with the key in the ON position. When i start the truck, all lights still work except for the brake lights. When I press the brake pedal they will come on for maybe 5 seconds, and then shut off themselves, even if i continue to hold the pedal down. If I press the brake pedal again they won't come on anymore until I turn the key off and back on. In the on position all lights work including the brake lights, the brake lights will also stay on for however long i hold the pedal down for, but once the vehicle is started, all lights work but brake lights will only work for that initial 5 seconds.
I spliced these lights directly into the factory wiring, im going to try and install relays in hopes to correct this problem. Im thinking the bcm doesn't like the load and is shutting down the brake lights, although it boggles my mind as to why all other lights work.
Hoping someone can shed some light! thanks in advance!
Thabk you for the reply, they are not LEDs, they are tied directly to the vehicle factory wiring, basically took the wires out of the factory sockets, and soldered connections to my new lights
Basically have a 1 running light wire, and a 1 wire for brake/turn signal on each side, so on each side I ran the running light wire to the lights that are just meant for running lights, and the brake/turn signal wire to the brake/turn signal wire on the lights, and as mentioned before they all work as they should with the key on.
interesting dilema. i have never run into anything like that.
try testing powet out of the brake light switch with engine running. if it stays constant, i would then suspect the blunker switch, or a wire going to the blinker switch in the column. but it makes no sense it works key on engine off but not with key on engine running.
I haven't tried the flashers yet, but I will an report back. I have ordered some relays and also led lights to see if either will help the situation , thanks for the replys!
Closest I could find in available diagrams was a 2013 f350 super duty. Do these colors match what you are using? I took a look at some other parts of the diagrams. There is no connection anymore from the hazards or the turnsignal switch to the lights. The turnsignal switch sends signals to a module in the cluster, and the module in the cluster communicates what is going on to the body module over a communication network. The body module does the power switching to the lights.
All your front lights function correctly right? Key on and off? In the old days all the running lights were fed with one wire from a single source. Now they have their own transistor in the body control module that sends a signal on a separate wire.
Thank you all for the replies, those colors do match my wiring. I got to my truck today and the led lights weren't delivered like they said they were, so I went ahead and put relays in, and that corrected the problem, I have brake lights now with key on and running, and all other lights work as they did and should, however, I now have fast blinking signal lights.....
Although, i kinda like the faster blinking signal lights I know its not "correct" so to say. Although at least for now i can drive the truck. If anyone has any input on the fast blinking signals id love to hear it and thanks again in advance!
fast blinking signal lights is because the truck thinks you have a light out as the relays are not drawing enough power. LED lights without load resisters will do that too.
Just a little strange the hazards flash at the normal rate, I understand my turn signals flash fast now because of the relay, but I don't understand how the hazards flash fine, but the brake lights would shut down before the relays were installed....
The computer might not be monitoring current flow with the 4 way flashers.
Adding a small bulb, for extra load, on the input to the relay might help. You are trying to make the computer think you have the correct current flow. Meaning it is currently thinking one of the bulbs is burnt out.
Are you using 1 or 2 relays?
Does the results change with brakes and blinkers at the same time?
I used 1 relay on each side for the brake/turn signal, and I needed 1 relay for the reverse lights as they were shutting down like the brake lights. The running lights are still wired into the factory wiring for the running lights. All is good now besides the hyper blinker.
I found a post, where I can use ForScan to go into the progaming of the bcm, and shut off the option for "lamp outtage" and that will stop the hyper flashing
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