Why Does My CTEK Battery Charger & Maintainer Use a Proprietary Connector Instead of SAE?
A proprietary connector is used instead of SAE because it prevents reverse-polarity connection and keeps the weatherproof seal intact. SAE plugs let anyone cross positive and negative, which can damage a charger or battery. I learned this the hard way after years of fighting corroded SAE plugs on my boat trailer. The molded click-in design … Read more