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steelshooter's avatar
steelshooter
Explorer
Mar 03, 2020

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 in the kitchen. Thisw only happens when i apply the brakes. I removed the access panel only to find a hole in the floor with some wires going under the floor. The buzzing noise is coming from here not the brakes. Everything works properly except for this buzzing noise. Anyone have a clue what this may be before I have to remove the rear stabilizers and belly cover to see what is going on. Thanks for your help. Feel free to put this in the proper forum
Larry

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  • dougrainer's avatar
    dougrainer
    Nomad
    Mar 07, 2020
    LED light Bar. Is this the BRAKE LIGHT in the center of the back wall? If so, that was NOT installed on your year model. To make a center Brake Light work correctly, when it was installed they would have installed a diode splitter to turn the Center Brake light ON only when BOTH Left and Right rear brake lights would come on. So, that would have been installed in the rear area where your noise is coming from. Hazard lights do the same thing as pushing on the Brake Pedal. Doug
  • steelshooter's avatar
    steelshooter
    Explorer
    Mar 07, 2020
    Update, I have now determined that the buzzing also occurs when the hazard lights flash. Buzzes each time the lights come on.It does not do it with blinkers. I pulled down the belly cover but the water tank is in the way. After really listening I am not sure the sound is not coming from behind the rear cap. So, is this some kind of relay that controls the tail lights and LED light bar during braking and hazard operation. Thank you for helping.
  • steelshooter's avatar
    steelshooter
    Explorer
    Mar 04, 2020
    Doug, I only have the issue during braking, the noise is not coming from the brakes. I will have to remove the led stop light to prove the problem but it seems this is where the noise is coming from. Thank you for your response
  • steelshooter's avatar
    steelshooter
    Explorer
    Mar 04, 2020
    I have not been able to connect back to the camper due to rain, bit I believe the issue is an LED stop light in the center back of the camper. I have not been able to connect to another camper. I can try that when the weather clears up.Thank you for your response
  • dougrainer's avatar
    dougrainer
    Nomad
    Mar 04, 2020
    I would disconnect the truck 7 way cord and pull the Break a way cable and see if you still have the noise. If so, I would suspect a rusted corroded Brake wire connection inside the underbelly. Are you the original owner? If not, maybe a previous owner installed some type of Aftermarket Break system controller. Doug
  • CA_Traveler's avatar
    CA_Traveler
    Explorer III
    Mar 03, 2020
    I'd check the voltage for lights, turn signals and brakes. I'm wondering about compatability between 13 yr old brakes and new truck brake controller. Or maybe a truck issue? Any chance you could try it on a different trailer?

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