Measuring voltage is one of the most common tests a tractor mechanic will conduct as he troubleshoots a system. The presence of the correct voltage will determine if a component is functioning correctly or not. A common voltage test will be of the battery. A healthy battery should read about 12.5 volts, and a battery that is being charged should measure between 13 and 14.5 volts.
In 2015 I built a Front end Loader and a backhoe for a 1974 International Harvester Cub Cadet 149. I built the reservoir into one of the loader towers, and ran an 8 GPM gear pump off of the engine’s front PTO Shaft. This pump was connected to a 2 spool directional control valve with a power beyond port. This power beyond port supplied oil to a 6 spool control valve that controlled the backhoe. My hydraulic system is set to have a maximum pressure of 1,000 psi.
To measure voltage on a battery for example you first turn your meter to DC Voltage. Place the red probe on the positive terminal of the battery and place the black probe on the negative side of the battery or on a common ground. Your voltage will display on the screen.
When something is wired “in parallel” it means it is wired alongside a circuit with its own positive wire. Now that we have a basic idea of electrical theory, let’s examine how it is all wired together. The example below illustrates wiring for an engine that uses battery ignition and a stator charging system.