Smarter Engine Ground Testing with the Power Probe MAESTRO & App When diagnosing engine electrical issues, testing the engine ground under load is critical—but doing it solo can be a challenge. That’s where the Power Probe MAESTRO and its companion app change the game. 📡 With the MAESTRO connected directly to the engine block, you can monitor engine ground voltage remotely while cranking the vehicle—all from inside the cabin using the app. In this real-world test, Danny Sehmi shows how a poor e