philup

ok so now that its nice and cold outside ive been having a annoying problem with my interior lights, when i turn my head lights on the headlights flip up and come on, they work fine but non of my interior lighting comes on. my high beams light works and my turn signal lights also work but nothing else. im sure its the headlight switch bc at first i just had to give it a tap and everything would come on but now i have to wait until the switch warms up b4 i tap it or it wont work. i have already looked at new switches which are way to expensive, like $450. so i was wondering could i make my own switch?