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Landscape lights seem to always be in need of repair. They look very nice, but occasionally you will have to change bulbs and troubleshoot them.
A customer called and said she had several lights in sequence that were out. The first thing to do is to check the bulbs. You can buy a new bulb or simply use a bulb from a working light, that way you know that the bulb is good. Place the bulb in the fixture and see if it lights up. If it doesn't, the fixture is not getting power to the bulbs socket. You can confirm this by using a multi-meter and touching a probe to the contacts.
Next, dig down to where the fixture connects to the cable in the ground. You can remove the contacts in the cable and use the multi-meter to see if there is power in this area. You can also try to attach the contacts in a different area of the cable. It may be that the old holes were corroded to point where the contacts were bad. Incidentally, if you do get a power reading on the multi-meter, it's probably time to replace the fixture.
Now since there are a sequential line of lights that are all out, I would guess that there is damage to the cable which is stopping power from continuing down the line. Start digging just past the last working light to the first non-working light and find the damage. At this point you can install a repair coupling and re-bury the cable. The coupling simply snaps over the cable which allows the electricity to continue to flow down the cable.
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