What was found
ENROUTE, PILOT OF FLIGHT 145 REPORTED THAT HE OBSERVED AN ACRID/BURNING ODOR IN THE COCKPIT. ATTEMPTED TO ISOLATE THE SOURCE VIA TURNING OFF ALL NON ESSENTIAL SYS THEN REACTIVATING THEM ONE BY ONE. HE WAS UNABLE TO ISOLATE THE SOURCE. ACFT LANDED WITHOUT INCIDENT AND MX WAS ADVISED. MX TROUBLESHOOT AND FOUND WINDSHIELD RESISTOR HOT, WINDSHIELD WIPER STUCK TO WINDSHIELD DUE TO BEING DRY AND WINDSHIELD SWITCH IN THE SLOW POSITION. UNSTUCK WINDSHIELD WIPERS THEN PERFORMED WINDSHIELD WIPER OPS CHECK WITH WET WINDSHIELD -OPS CHECK GOOD. ALL WORK DONE IAW MM 30-40-00.