Loud buzzing when applying brake
I have a 2007 Fleetwood 325rkts. I have never had previous issues. Now I have purchased a 2020 GMC 2500. After connecting the camper to check lights I have a loud buzzing coming from under the cabinet...
Forum Discussion
wnjj wrote:
The box probably has relays inside and from what I’m reading online, it’s possible that 2019 and newer GM trucks may be sending PWM (pulse width modulated) signals on the lighting circuits. That would cause all kinds of havoc with relays connected to the line.
There are people having issues with backup cameras powered from the running lights.
You may have to replace the box with a solid state equivalent.
This was my guess as well. Not much you can do to get around it.
Take a video of the tail lights while it's buzzing and you may be able to see them flicker.
