Hoping someone can help. I have a 1992 sc300 and when i turn the headlights on i lose the dash lights and the radio lights. Checked all the fuses and the only thing i think it could be is the dimmer switch? If i turn the dimmer switch all the way up until it clicks the dash lights work but no radio lights or anything? Am i right about the dimmer switch being bad or is it something else? Thanks in advance

 

Sorry I am not helped