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Anyone using a CTEK MUS 4.3 to keep their battery charged?

Old Mopar Guy

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15 Hellcat Challenger
#1
I’ve been using it for years without issue. Lately only the green light is on, blinking, indicating the charger is plugged in and powered up. No other lights lit, indicating the charger is not “seeing” the battery. Looking at possible causes according to the manual, none exist. The battery is fully charged, according to my other charger, connections are tight, etc. Any thoughts? Thanks.
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