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What additional lights did you add? Did you swap out incandescent bulbs, replacing with LEDs?

Fast flash typically indicates that a bulb is out, or that there is not enough current draw on the circuit for the flasher to flash at its normal rate. The happens fairly regularly when one installs LED bulbs without adding additional load on the circuit.

Before getting into what you can do, please confirm what, exactly, you changed and/or added to your lighting circuits.
 

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Tony,

I always believed just the opposite.
When more current is drawn on the flasher, the faster it goes. Like when I hook the trailer, behind my truck and the turn signals become significantly faster--blinking on the truck and trailer at the same time ?????
Am I wrong ?
 

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lesn said:
Tony,

I always believed just the opposite.
When more current is drawn on the flasher, the faster it goes. Like when I hook the trailer, behind my truck and the turn signals become significantly faster--blinking on the truck and trailer at the same time ?????
Am I wrong ?
On the LT, the lights flash faster with LESS load on the circuit. Many people add a load resistor pack to the circuit when converting to LED lamps to create enough draw on the circuit to keep the flasher and the computer happy.

I have has the same result on all four of my LTs (1999, 2000, 2005, and another 2005).
 
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