I have a 1997 Blazer that has no working turn signals and no break lights. The truck has been to the shop, the bulbs were tested, the fuses were tested, the signal flashers were changed. Nothing has fixed the problem. The truck has been having other electrical problems such as window sometimes not rolling up and power door locks not working. All of this within a short period of time. Not sure if this makes sense, but the engine was shampooed and it seem like the problems started after that!If anyone has an idea of what I can try next I would be thankful!