Not sure if CTEK changed their connector ends or not but it doesn't fit my CTEK Multi US 3300. It fits the SAE fine -side (battery type). batteries), but is not suitable for connecting the CTEK charger. My CTEK has a rounded connector and a square connector, and this adapter has two rounded ends. I don't know if it was done wrong or if there is a product change and I can't find anywhere where the change is mentioned. You'll probably have to return.
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