What was found
ON FINAL FOR LANDING WITH FLAPS 30 AND GEAR DOWN THE NOSEWHEEL GREEN DOWN AND LOCKED ILLUMINATED INTERMITTENTLY CAUSING THE GEAR WARNING HORN TO GIVE A STEADY AURAL WARNING. A GO-AROUND WAS ACCOMPLISHED AND QRH CHECK LIST WAS RUN. AFTER RECYCLING, HAD 3 GREEN DOWN AND LOCKED INDICATIONS WITH THE NOSE WHEEL ALIGNMENT STRIP SHOWING DOWN AND LOCKED. NO FURTHER WARNINGS AFTER RECYCLING GEAR. INSP NOSE GEAR LOCK INDICATING SWITCHES, FOUND SWITCH D-298 CONNECTOR LOOSE. TIGHTENED CONNECTOR PLUG AND PERFORMED TEST PER 727-200 AMM 32-61-071-5, OPS CHECK GOOD.