Low Beams dead, Hi Beam Fine?

People tend to forget how their minds worked when they first started wrenching and troubleshooting. It's easy to sit here as a seasoned veteran and give people troubleshooting advice that seems perfectly clear to you, but to a newer guy, it's almost like trying to read another language. Don't you remember a time when people would talk to you about cars and you had no idea what they were talking about?

Think about it. You need to know the concepts of how DC voltage and current work. Then you need to know how to use a volt meter or a test light correctly. Then you need to know how to read a schematic and make sense of how it's adapted to the actual physical location in the car. Then you need to be able to follow the wires through the car without getting lost. Then you need to know how to troubleshoot at each possible failure point. Not only that but you need to know what is the expected working or failed condition at each point that you're troubleshooting. This isn't information you can just download into your brain all at once.

Take a guy who doesn't have those skills yet and just wants his lights to come on and you've got guys yelling at him like he's either stupid or lazy because he's not doing the exact troubleshooting steps that you want him to do. Well maybe he doesn't understand how to do every single step you're telling him to do? One simple mistake can have you chasing your tail for hours.

It takes a lot more work to change a part out than it does to check real quick with a volt meter. Ever think that they're changing the part out because they don't understand how to do what you're telling them to do?

Seriously, cut people some slack once in a while. Maybe sometimes they just need a little more information. Information that seems like common sense to you with thousands of hours of experience might just be the information they need to have things click in their mind and open themselves to now being able to receive the information you're giving them and put it to use.