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The TL CTSY 20 amp fuse on a 1989 S10 Blazer controls the interior courtesy lights. This fuse is responsible for providing power to the lights that illuminate the interior of the vehicle when the doors are opened or the interior light switch is activated. If this fuse blows, the interior courtesy lights will not function, potentially leading to reduced visibility and convenience within the vehicle.

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ProfBot

8mo ago

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