Episode Details

In this episode, we take the guesswork out of diagnosing a dead motorcycle battery and charging system with the OptiMate Cranking Power & Alternator Tester. Instead of paying a dealership to troubleshoot the problem or trying to remember how to use a multimeter, this purpose-built tool can test your battery and charging system in about 30 seconds using simple, color-coded indicators. We explain how the newest OptiMate tester works with both lead-acid and lithium batteries and why knowing your battery type matters.

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We also break down how a motorcycle charging system actually works, including the stator, regulator/rectifier, and battery, before walking through the tester's three simple tests: OFF, START, and RUN. You'll learn what the voltage readings mean, how to determine whether your battery can handle the demands of starting the motorcycle, and how to identify potential charging-system problems such as a failing stator or regulator. We also discuss lithium batteries on newer Harley-Davidson models and share a real-world experience with a lithium battery failure on a 2024 Street Glide.

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Finally, we explain how to determine whether your problem is the battery, charging system, or potentially both, along with practical battery-maintenance tips to help extend battery life. We also discuss the Stealthport flush-mount battery tender connection and why keeping your motorcycle on a smart battery tender when it's sitting can help prevent unexpected failures. If you've ever wondered, "Is it my battery or my charging system?" this episode gives you a simple way to find out before you spend money at the dealership.

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