Probing to test voltage in electrical connectors on farm equipment can be a challenge. Here are some tricks:
A straightened paper clip fits the sockets on many electrical connectors. It’s easier to make contact with a voltmeter’s probe against a paper clip inserted into the connector than to fit the bulky probe into a tiny socket.
Whenever possible, identify and use the ground circuit in any wiring harness connector for testing rather than by grounding to the machine’s frame. Low-voltage computerized systems are often grounded all the way to the battery via dedicated ground circuits. Grounding-to-frame can give faulty readings.
When it’s necessary to test a “live” circuit, it’s better to back-probe into the rear of a harness connector than to pierce or shave the insulation from a wire. Once insulation is disturbed on small gauge wires it’s difficult to completely seal the disturbance against moisture. Back-probing a connector with a straightened paperclip is an option; there are also special tools specifically designed to back-probe connecting plugs.
Read More from Dan:
5 Guarantees When Working on Machinery
Planter Oil Leaks: Common Causes and Fixes
