Clicking Noise From Flasher When Turn Signals are Off on GMC Sierra 1500 HD

A clicking noise may be noted from the turn signal flasher after the turn signals are switched off.  This is commonly cause by a faulty turn signal switch which will require replacement.

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Average mileage: 177,333 (114,000–235,000)
7 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007
10 people reported this problem
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problem details
2001 GMC Sierra 1500 HD 183,000 mi,
Replaced switch, problem solved.
2004 GMC Sierra 1500 HD 114,000 mi,
when i start the truck i hear click click click coming from under the dash this is intermittin could it be because i used the signal light when i pulled in and parked and the rely is sticking open the ticking goes on for about 20 or 30 seconds after i start the truck
2002 GMC Sierra 1500 HD 235,000 mi,
replaced flasher relay. not fixed