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I have the older standard 4.3 MUX CTEK and it flipping back to orange when it is "disturbed" is quite common. Happens on all my cars (2 of the 3 are always on a tender).
So I gave up on my 2016 maintainer. This year my car is going into a tomb and I can't risk the plug losing contact in the trunk plug in mid-winter...l've been twisting it in for too long. Plus, I dont get the orange light thing.
I put it on a Noco Genius 5 today and it's great. Regular reliable pulse. Plus it has all kinds of modern protections...thermostat control, auto-repair function, desulfator, overcharge protection. Also has warning lights for various conditions. So I'm done with the flipping orange-green lousy contact vette plug. Hopefully for the better.
Great discussion, started out as AGM? Migrated to maintainer to tenders , etc. So purpose of a maintainer should be to not let the parasitic draw drain the battery and not overcharge. You get what you pay for. A cheap tender just dumbly puts a current out to battery, not watching the voltage. A smart charger or smart maintainer will allow you to select the battery type, then adjust it's self to keep the battery at near full charge without boiling the acid or overcharging plus pulsing to de- sulfinate. The GM/ vette approved device is doing that shown by the lights changing after opening a door or just by itself. I know this will get blowback but I like and use a Harbor freight Viking smart charger. It has many modes to set. flooded, Agm, but also auto turndown to go from 4 amp to snowflake or sleep/ maintainer mode. Plus pluses to desulfinate. I have a cheap NOCO and it is ok for my riding lawn mower. Finally, read the specs and see what your device going to provide. Or put an ammeter across one leg and watch what it does. My c6 '05 has 25 ma of parasitic draw. Not bad, but not good for a month of storage.
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I am a big Battery Tender supporter. I have the rings installed on the battery permanently. No chance of the Corvette supplied tender losing connection. I use the 5 amp version which is always on sale at Costco online for less than 1/2 the price of Amazon.
