TIA- A transient ischemic attack (TIA) is a temporary period of symptoms similar to those of a stroke. A TIA usually lasts only a few minutes and doesn't cause permanent damage. Often called a ministroke, a TIA may be a warning that a full irreversible stroke is about to occur. A TIA is a medical emergency and should be treated as a stroke until proven otherwise. Even if the symptoms subside emergency medical care should be sought.i hooked up my cruise lights and when the truck is running they are flickering on and off but all the connections are good and the voltage is constant at 14 1 volts any ideas as what would cause this also i have the lights set on the high level TIA
i tapped in to the park light circuit off of a marker light in my service body and it is constant 14 volts when the truck is off the cruise lights are steady on and when i start the truck and running that is when they start flickeringAre they on a dedicated circuit or did you tap into another circuit for power?
LEDs on steady burn are sensitive. You probably have alternator noise/pre-failure. If the battery power makes them work right and the running vehicle causes a flicker then the circuit they are on is "noisy" or "dirty" power. You can either get a filter (usually for radios and medical equipment), fix the alternator, or trip a relay from the marker light source but power it from a "clean" source. But at the end of the day to get to the heart of the matter take a look at the alternator, it likely has a bad component or one getting close. Essentially the inherent AC current that the alternator produces is leaking through. This is all very crude terminology on my part, I am not explaining it exactly right, but essentially the alternator produces AC power that gets converted into DC. When alternator components start to fail or simply operate outside their specs, you see (or hear) the effects in sensitive electronics.i tapped in to the park light circuit off of a marker light in my service body and it is constant 14 volts when the truck is off the cruise lights are steady on and when i start the truck and running that is when they start flickering
it is a 2020 f350 sd xl package gas engine and the other leds on the bed seem to work okay and no flicker issuesWhat year of vehicle are we talking about?
I had similar issues with my truck (‘14 RAM). Lights were fine when truck was in the ACC. But flickered when truck was running.
When the truck is running the BCM sends out pulsed 12 in an effort to give longer life to the halogen bulbs. But when LED’s were introduced, because of the LED nature as we know, the bulbs showed the pulses. In my case, I had to go into the programming of my BCM and tell it to stop by changing some settings. I then used that signal to power a relay. Without changing the BCM signal, the relay would chatter.
That is really interesting. I was not aware of a feature like that, but I can imagine that would be the same sort of outcome as dirty power from a bad alternator. No matter what you have sensitive LEDs that are showing the fluctuating nature of the power.What year of vehicle are we talking about?
I had similar issues with my truck (‘14 RAM). Lights were fine when truck was in the ACC. But flickered when truck was running.
When the truck is running the BCM sends out pulsed 12 in an effort to give longer life to the halogen bulbs. But when LED’s were introduced, because of the LED nature as we know, the bulbs showed the pulses. In my case, I had to go into the programming of my BCM and tell it to stop by changing some settings. I then used that signal to power a relay. Without changing the BCM signal, the relay would chatter.
Frustrating to say the least.That is really interesting. I was not aware of a feature like that, but I can imagine that would be the same sort of outcome as dirty power from a bad alternator. No matter what you have sensitive LEDs that are showing the fluctuating nature of the power.
I would not be surprised if you have the same issue as I did.it is a 2020 f350 sd xl package
I agree, the equipment for testing one theory is a bit expensive. But if you could see if it was 60hrtz cyclic interference vs. small voltage changes you would have your answer. 60 cycle would be a bad alternator showing it's AC side, and pattern of small voltage changes would be likely be intentional voltage pulses from the vehicle's computer. I am again not an expert in this terminology, but I know that AC show through as "dirty power" is a common radio interference problem. The alternator is probably going to need an expensive oscilloscope. The oscilloscope helps to find the output wave form and determine if it is a classic failure pattern. The voltage micro fluctuations in voltage in a repeating manner by design should actually be able to be picked out on a sensitive multimeter. I also recommend the relay as both a fix and a testing method. Voltage changes could "click" the relay whereas 60 cycle would not. Also what ever testing you can do with the power you tapped from the marker light will be good info. I know marker lights are more and more proprietary and maybe the marker lights are designed for the pulsed voltage.I would not be surprised if you have the same issue as I did.
John M. does bring up a valid point of dirty alternator and I would investigate this also to rule out/in.