If your tail lights sequence during emergency flasher operation, you cannot use a 552 thermal flasher for the emergency flashers. However, it cannot be used for the turn signal flasher because they flash too fast. Note: With 1157 bulbs, a 552 thermal flasher can be used for the emergency flasher. Test by temporarily swapping the emergency flasher with the turn signal flasher. Intermittent flashing can be caused by a bad flasher can. Further turn signal switch testing details can be found in this guide: Use a self-powered test light or VOM on the lowest ohms scale to test switch according to the table in the guide. No output on all bulbs of a given side is typically caused by a bad turn signal switch contact or fried (oxidized) connector pin at the turn signal switch connector. These symptoms point to multiple problems: Start with reviewing the troubleshooting guide on Will be a day or so before I can get to work hands on with it but I will let you know my results later. Thank you sir, I also downloaded the wiring diagram to aid in getting everything right. The replacement electronic unit, C7WY-13A366-CR is not sensitive to the alternator output and will work with either LED or 1157 bulbs. It gets worse when the brake lights, headlights, and/or AC is on. The fact that yours works for a few flashes indicates that the battery/alternator current is dropping below the threshold level. The K7 relay is calibrated for four 1157 bulbs to be turned on at full brightness before it will trigger the dash indicator light. ![]() ![]() The symptom of the indicator lights failing to flash is a weak electrical system or a bad (or out of calibration) K7 relay. ![]() If it has power, replace the relay with a C7WY-10B926-BR relay. Test by unplugging the 3-pin relay located on top of the relay panel bolted to the windshield wiper motor.Ĭheck to see if there is 12V power on the light blue wire. This problem of both indicator lights flashing together is usually caused by a bad K6 (emergency warning relay) under the dash.
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