First remove the circular black rubber cover on the back of the housing assy. Pinch the little release lever carefully on the wiring harness and pull back and lay aside for the moment. In this opening you will find a black plastic locking ring. Carefully twist it off. (visually note the orientation of the ring), next remove the bulb assy. Reverse these steps to install. A little dab of dielectric on the contacts may prevent future corrosion. These parts are brittle plastic so be patient as not to break anything, they break easily. The right headlight assy can be tricky, as the battery is located right behind the opening.But it can be done. Estimate 30 mins job time total for both. Good luck.