It took me a while to figure out that I needed to continue to use the factory retaining ring. This was never stated in the instructions. The instructions need to be more tailored with better attention to detail. I figured it out after a while after playing with the cable but in the beginning, the light just wouldn't stay in per the instructions and it was only after playing with it that I figured it out. The same thing with the taillights I ordered. Instructions were great until I got to applying the dialectric grease (couldn't see the picture at all) and it should be clearer that you need to remove the bulb first and plug it in there. Just the little things. I am planning on ordering the foglights and signals next. Great products. Reverse lights have been running for two years now w/ no issue.