Download Article Show Easy ways to test the charging capabilities of a standard or car battery charger Download Article Knowing how to test a battery charger, whether it’s for the rechargeable kind used in small appliances or the one that powers your automobile, can be useful for making sure that the device is reloading batteries to a usable level. The procedure for testing a battery charger is similar regardless of the type of battery you’re working with. Connect the positive and negative test probes of a multimeter tool to the corresponding contact points on the charger. The device will then give you a reading displaying the voltage being put out by the charger.
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About This ArticleThanks to all authors for creating a page that has been read 131,438 times. Is this article up to date?How can I tell if my battery tender is working properly?If the battery is fully charged, then the Battery Tender Plus battery charger's green light will be on. Once the AC power is removed from the Battery Tender Plus battery charger, the green light will go out and the charger not have any effect on the battery.
How do you reset a battery tender?To activate the battery simply press the RESET button located at the end of the Quick Disconnect (QDC) charging harness for ONE second, then if the engine fails to start on the first try, a load such as the headlights can be used to warm the battery.
Do battery tenders go bad?Yes, I had one go bad. I own (owned) two of them. One (which had previously worked) would no longer keep my battery charged. I switched to the other one and the battery charged (and stayed charged) without issue.
How do you know if your battery charger is bad?High resistance will prevent the charger from working properly. Next, set the charger to a specific voltage setting and attach the voltmeter. If the reading on the voltmeter doesn't match the voltage setting on the charger, the charger is likely bad and will need to be replaced.
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