Per putco you would need 1 load resistor inline with the wiring harness feeding led bulb for a turn signal.
Adding load resistors for led turn signal light bulbs.
The resistors fool the flasher unit by recreating the proper amount of resistance and once installed the turn signal bulbs flash at the correct rate.
I believe your sierra has two bulbs per side one for the running lamp one for the brake turn signal.
Another slightly better solution for adding resistance to the circuit is to buy a load resistor or a dummy load.
I recommend the putco p230004a 2 resistors.
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Obtain a set of easily installed resistors.
If you don t install load resistors also known as equalizers with led turn signal bulbs you will experience the notorious hyper flash issue.
You only need to install load resistors on the circuits feeding the turn signals.
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A load resistor essentially serves the same purpose as the incandescent bulb in the solution described above it simulates an electrical load drawing sufficient current to the dimmer switch.
Should this occur the solution is simple and readily available.
To add a load resistor to an indicator turn signal it has to be wired into each led light bulb in parallel.
You will need 1 load resistor for each led turn signal bulb installed.
The load resistor goes across the light bulb connections between the supply and ground.
Why are installing load resistors necessary for led turn signal lights.
Led turn signal resistors.
If you will have glass andled bulbs on one vehicle you do notneed to add a load resistor to any glass bulb only led.
Hyper flash is exactly what it sounds like where the turn signal light flashes rapidly and is almost headache inducing.