99 tahoe rear tail light issue (need some help)

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TahoeGibson

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Having an issue that is starting to get on my nerves, last weekend I started having an issue when I press the brakes while either signal light is on it would cause signal lights to blink faster, later on when DRL are on I have no operative rear lights. Now I have checked and even replaced the ground due to corrosion, also replaced both rear tail light circuit boards but still the problem occurs (also checked the obvious fuses and bulbs but all check out). Now I'm not to sure it there is a possible short in the circuit or what, just curious if anyone has come across this issue before and doesn't mind lending some advise.. thanks.
 

lesterl

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Could be the multifunction switch (turn signal lever/ hazard swtich.)
 
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