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Check the bulbs before you worry about the flaaher
 

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you say the left signal flash is faster .. so you have to remove those bulbs and see if the pins/socket connectors are corroded... the flash module will not cause the left side only a hi speed flash..
possible wiring problem .short issue ..
 

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J cat, I'm still waiting for him to check for a burnt out bulb.
 

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Lol. Your 2009 truck must be a lot more hi tech than mine from the last century. I’ll be interested in how your problem is resolved.
 
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