I'm not sure what the question is, as I don't know what you mean by "turn on fuse". And which dash light won't go on? If you mean all dash cluster lights do not go on, even with a good fuse installed, does the headlamp switch turn to dim or increase these bulbs? If so, and it's not working, you may have a bad switch, or some instrument clusters get all their power from a plug which locks into the back of the cluster. These sometimes get loose or the lock tab broken, thus making poor connections. Also, helps to know what vehicle you are working on.
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