cant increase brightness on dash without dome light comming on
Then you have a bad switch. Most likely the reostat has dislodged and is making contact with the dome light contact.
I replaced the switch, no change
Well that's just nuts, the switch is the only thing those two have in common, And your sure the connector isn't messed up or there is a stray piece of wire. Right now I be hooking up voltmeters on both dash and dome light circuits and see if there is any stray voltage. Has there been any work done on the interior lighting or dash cluster?
no work that that im aware of
Well then it's time for circuits too be checked, it's got to be crossconnected there somewhere.
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