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Lamp or Light. In this case it activates the charge light relay which turns off and on the charge warning light. NOTE: You don't see, in this diagram, the L wire to the Super Glow Timer. Rudi

When you hook up your battery, you activate several circuits. Each circuit "figures out" the situation it's in. That's what makes the relay click on and off. As Fitzmooney mentioned above, the signal L (High when engine is running) from the alternator circuit (internal or external regulated) is...

Have a look at this thread: https://forum.ih8mud.com/diesel-tech-24-volts-systems/490421-glow-plugs-wilson-switch-superglow-how.html He added a wilson switch to his "super glow" system. Rudi