To replace the emergency flasher on a 1999 GM 3500, first, locate the flasher unit, which is typically found under the dashboard, near the steering column or in the fuse box area. You may need to remove the lower dash panel or cover to access it. Once located, disconnect the old flasher by pulling it out from its socket and replace it with a new one, ensuring it is securely seated. Finally, test the emergency flashers to confirm they are functioning properly.
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