I made a cheap and dirty for my '84 GMC... A 12 volt buzzer horn from Radio Shcck and a 3 amp (or more) diode. Wire in series and hang between a ignition terminal and the light terminal on the fuse block. If it sounds when it shouldn't then reverse the leads. Here's what happens: Ignition and lights off - no voltage - no sound. Ignition on - lights off - diode prevents current flow - no sound. Lights on - ignition on - same voltage, no sound. Lights on ignition off - SOUND - current flows from lights through sounder and diode and grounds back through ignition circuit (somewhere). Should be able to find empty terminal for lights and ignition right on fuse block.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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