GFM Network News


Relays use an internal electromagnet to turn on and off the flow of electricity.

How to check for a faulty relay

If a component isn’t working, is the relay to blame? Here’s how to check

Many electrical components in a vehicle or machine are controlled by a relay. So if a component isn’t working because electricity isn’t getting to it, there is a possibility the relay may be faulty. But determining whether or not a relay is defective requires a little basic investigation. Here’s how to go about it. First, […] Read more

Before assuming a parasitic power drain was causing the battery to go dead, we checked the charging system with a multimeter. The multimeter reading of about 14.5 volts with the tractor engine running indicated the alternator was doing its job.


How to track down an electrical fault

We trace the source of a tractors' parasitic power drain with a multimeter

Automotive electrical systems in newer machines that make extensive use of computer processors can be very complex and confusing. But there are a lot of machines on the farm with electrical systems that won’t have anywhere near that level of complexity, especially those with diesel engines and no computer controls. Finding and fixing electrical faults […] Read more