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Boat › Basic electrical › Flat battery › Testing the battery › Battery not charging

This video covers the basics on how a battery is charged by an outboard motor. If your battery isn't charging due to a failed regulator-rectifier and it needs replacing, use the links below to find the correct part number:

Testing a bridge rectifier

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The bridge rectifier turns AC from the outboard's charge coil into DC for the battery. I test each diode in both directions with a multimeter's diode mode, though a built-in regulator can upset the results.