Replacement lighting control module for motorcycles using the WIRE PLUS lighting control with 2 bundles. The rear bundle, (4 wires), is approximately 4 feet long. If your turn signals are no longer working correctly, this may be the fix you need. The 11604 lighting control was included on many WIRE PLUS wiring systems. The 11604 lighting control module controlled the operation of the front and rear turns signals, provided load equalization and auto cancelling.  It also operated the rear turn signals as brake lights.

The 11604 does not have a white/blue wire, if your module has a white/blue wire order the 11921 instead.