The most common place for the flex circuit to fail is at tab that forms the instrument light contact.. The copper tends to crack from the combined effects of corrosion, vibration and the wear and tear of replacing bulbs. The failure cannot be repaired by soldering the tab back to the main circuit since the solder joint will be stiff and it will crack.
To repair this type of failure solder two pieces of copper braid to the existing circuit, then bend them down as shown in the picture. Solder Wick is the common trade name for this type of copper braid. It can be found at electronics supply stores like Radio Shack. First, carefully scrape the protective coating from the area above the break using a sharp knife. Then solder the end of the braid to main circuit where the coating was scraped away. Apply the solder sparingly or it will be drawn down the braid (that's why they call it solder wick). Replace the braid if it becomes filled with solder, since it will be too stiff to bend. Cut the pieces of braid to the same length as the tab and bend it into the hole. Then replace the bulb socket into the hole. The picture shows the completed repair with the braid sticking down into the top of the rectangular hole. The instrument light bulb is also shown
So far this repair has lasted one season, and I expect it to last many more. (As of November 1998 it has lasted almost 10 years)
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