Are they dimming or actually flickering?
If dimming, just put a voltmeter across the batteries and see if the voltage drops when they go dimmer.
IF the voltage drops, use a hydrometer on your batteries to see if they are sick. If they are several years old they are probably drawing the voltage down trying to charge.
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Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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