If you are talking about the dome light, just squeeze the plastic lens and pull it off. Be careful when pulling out or re-installing the bulb - if it slips out of your fingers, it falls down into "the abyss" (the space between the frame and the inside cover) and you won't be able to get it out. You will need to buy another one.
inside the door panel
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how to replace a blend door actuator on a 1999 ford ranger
how to replace oil pump in a 1999 ford ranger xlt ext cab 4.0
very carefully.
there;s no switch for those lights all you have to do is be sure that is not dirt in the latches otherwise the dirt won't let thiose light go on spray them with wd40 and you'll see
The check engine light on a 1999 Ford Ranger is between the full mark of the gas gauge and the left turn signal arrow
The gauge assy has to be taken out and the printed circuit can be damaged very easily. I suggest taking it to a garage.
In the fuse box.
Inspect at 120,000 miles , replace if needed ( Ford maintenance and the Gates website ) for the 2.5 liter , 4 cylinder , in a 1999 Ford Ranger
dash light location on a 1999 hound accord V6
you have to pull the engine.