With any electrical problems its good to always check the fuses first. You could just also have two burnt out bulbs. Check to see if your brakelight and highbeam are out as well. If they work then you just need to replace the bulbs. The ports that the bulbs plug into could also be dirty. In that case remove the electrical wires from the plastic housings and clean the metal connectors with a wire brush. If you are still having issues, in '99 Isuzu was owned by Honda so you could call your local Honda dealer for assistance.
No if the bulbs are out, then you have to change the bulb just like you would in a lamp in your house. Take it to your local autozone and they can help you get the right bulb for your car
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