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2004 Silverado 2500HD Trailer shorted out turn signals and now the turn signals wont work

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2004 Silverado 2500HD a Trailer shorted out turn signals and now the turn signals wont work I have checked all the fuses under the bonnet and on the interior they are all fine. It will click once when you put the turn signals I can excite the flasher by putting a test lamp on of the four  fuses for the turn signals it dose flash fast as it is reading only one lamp connected but will not send signal to the lamps help would be appreciated thanks Richard (the cruise control was not working last time I drove it as well)

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Yeah, check the bulbs, apparently they provide the resistance for the flasher to work. I know using LEDs on a vehicle designed for incandescent bulbs you'll need a resistor to make the flasher work. I suppose the flasher could be FUBAR too.

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