What are the symptoms - are the high beams actually on or is the dash indicator on but the high beams aren't? The later usually indicates a wiring issue which may be as simple as the connector not plugged near the steering column.
'94 YJ - SBC/AX15/231, SOA, 8.8, 34" swampers
'06 LJ Rubicon - 31" ATs, OME 2.5", belly-up skid, other junk
'75 CJ5 - 232/T14/D20, 'glass tub w/ 2" BL, otherwise stock