Bradc_00

New member to the site and a couple problems maybe you can help me with. First thhe cruise does not work and second the truck ticks when you fire it up but after about 30 seconds it stops. So any ideas?

ATOM

1. the ticking is normal, cam phasers are making the noise. there is a tsb on this issue, however, if you have no warranty, it's gonna cost you.
2. do you have a led bulbs in the 3rd brake, or are the bulbs burnt out?

Ftruck05

Cruise should be run off a fuse, maybe the fuse is blown. I also agree with Atom. These trucks tick like a timebomb. I've had 90,000 flawless miles on mine so far.

Bradc_00

well no warranty so thats out and the fuse is good so thats not the prob but what does the 3rd brake light have to do with it.

ATOM

if you put leds in the 3rd brake without a resistor, the cruise will not work.

Mod (Ret.)

Or, if you install LED's in the tail lights, this too will kill the cruise. I installed an LED 3rd brakelight along with LED 3157 bulbs in the taillights. Cruise did not work. I removed the LED cruise, still did not work. Removed the bulbs, cruise worked.
I have been informed by others that post here as well as the FordF150.net forum that some manufacturers of the 3rd LED assembly put a load resister into their circuits, and have been installed without cruise failure.

Bottom line as I see/read it, a "cheap" LED third brake light could kill the cruise, or installing 3157 LED bulbs (notice I did not say LED taillight assemblies) will kill the cruise function. Ford apparently detects a voltage/current flow in the brake circuit when the brakes are applied, and uses this to disable the cruise function during normal conditions (I.E. stock 1157 bulbs in the taillights, and the standard bulb installed in the 3rd brakelight on the cab). Since LED bulbs have a very low voltage/current draw, the cruise circuit thinks the brakes are applied, and the cruise cannot be set/activated.
Some of the LED taillight assemblies have a built in load resister in their circuits, and therefore do not dis-able the cruise when installed. Ask the retailer about this if you're going to buy.

englandcrown

My cruise problem is a little different, maybe ATOM or someone can help. It works, but sometimes my MPH trails off a bit before it kicks in after I hit the button. Is there a vacuum line I should check out?

ATOM

if it works, i'd say to hell with it, there are so many things tied into the cruise, you would have to test all the components to see if it was on of them, wait til it breaks IMO, not worth the work

Inputs:

• Output shaft speed (OSS) sensor
• Digital transmission range (TR) sensor
• Speed control switch(es)
• CPP switch
• Speed control deactivator switch
• Stoplamp switch
• Accelerator pedal position sensor

The outputs of the PCM for the speed control system are:

• Speed control indicator lamp
• Throttle command