You can't reset these lights unless the problem has been fixed. If you replaced the alternator and the light is still on. You have other problems. If you took it to a garage, take it back. They replaced a good alternator. If you weren't in an accident and the airbag light came on, with the alternator. Most likely the ECM is bad.
Disconnect battery; turn the key into Ignition a couple of times to wipe out all capacitors; reconnect the battery. This has to reset your board chip.
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they had to unhook the battery cables ans leave them off for a while then it reset mine. sometimes you will have to take and hook them up to the computer to the car/truck and reset it that way
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