Spent $150 on a professional-grade multimeter and it saved me three hours diagnosing a phantom drain

My cheap one gave bad voltage readings for months until I bit the bullet on a Fluke, and that parasitic draw I was chasing turned out to be a stuck interior light relay. Has anyone else had a cheap tool cost them more time than it was worth?

2 comments

2 Comments

the_richard3d ago

Started chasing that same ghost for a weekend with a ten dollar meter from Harbor Freight. That thing was about as reliable as a weather forecast. Swapped to a decent Klein and found the issue in fifteen minutes flat, a corroded ground strap behind the dash. Sometimes you really do get what you pay for, and in this case that stuck relay cost you three hours of your life you're never getting back.

lucaslane3d ago

Borrow a buddy's tool next time if you can, or spend the fifty bucks on a Klein. That cheap meter will lie to you on resistance readings every time, which is exactly what gets you with ground straps. Old grounds are the devil, they look fine but measure open under load. You can test them with a simple voltage drop test, just put the meter on DC volts and check from battery negative to the ground point while cranking, you want less than 0.1 volts. If you see more than that, you found your problem.