Troubleshooting Sequential Turn Signals This article covers troubleshooting 1967-1968 Mercury Cougar sequential turn signals. While most the information has been acquired through experience on a 1968 model, the ideas can be applied when servicing a 1967 model too. This information is also applicable to 1967-early 1969 T-Birds as they share the same basic design. The turn signal system has five.. We had the opportunity to help a client with their newly purchased 1968 Mercury Cougar that had sequential taillight issues not working. We show you the updates and wire clean up and diagnosis we.
Check circuit 440 the white wire feeding the K9 relay for power when the turn signal is in the right hand mode. If there is no power here with the ignition on and in right hand mode then your turn signal switch or wiring to this circuit is suspect.. Mercury Cougar Sequential Wiring Manual Share your knowledge of this product with other customers. Be the first to write a review