led light bar issues

B

BWagner15

PR Member
I added a 30 in led light bar on the cab protector facing backwards toward the trailer on my semi. Ran negative from light bar to the frame ground stud. Then ran positive wire from hot wire on light bar to factory switch in cab. Light bar turns on and is bright it just makes a high pitch hissing/humming sound. Has anyone ran into this or have a clue what would cause it. Thanks
 
When you say frame ground stud,are you saying light bar frame or truck frame? If its truck frame I would run a shorter ground wire to a bolt you mounted light bar with,you might be picking up something from back feed from another ground wire.idk just my opinion and you know what they say about opinions lol
 
Im assuming you are using a 12v DC LED connected to 12V DC from the truck? If not and there is an LED driver then I would say the driver is bad.
 
hershey said:
Im assuming you are using a 12v DC LED connected to 12V DC from the truck? If not and there is an LED driver then I would say the driver is bad.
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It is a 30in led off road light bar, I tested the wires at the switch and there was 12.46 vdc to that point. It is hooked up to a factory auxiliary switch in the cab
 
Use a good meter and check the voltage at the light bar while it is on. If the voltage fluctuates then you have a bad source, if not you have bad LED's
 
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