Relay Module Wiring Diagram - We feature 2000+ electronic circuits, circuit diagrams, electronic projects, hobby circuits and tutorials, all for FREE! Since 2008 we have been providing simple to understand educational materials on electronics for engineering students and hobbyists alike.. http://timers.shop Like us on Facebook YouTube Channel Page 4 2. Timer wiring diagram 2.1 Connecting 5amp timer. Cooling Fan Relay 1 Control Circuit. What does that mean? This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models, 1996-newer..