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I have an 03 F-350SD with the 7.3 4X4 Auto trans<O</O
The Directional Relay (flasher) ford part #F65B-13350-AA constantly buzzes I replaced the relay and it still buzzes. The buzzing will stop if you apply the brakes turn signal or emergency flashers. The bulbs are all good and all work. I took the brake light switch apart the contacts all look good, no burning on the contacts.
Why not try asking over in the electrical forum. I know it isn't as specific to our trucks, but some of them ol' boys over there really know their electrons!
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