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There are no connections to the ignition system or engine. Just connect to the starting and auxiliary batteries. The unit is fully waterproof with reverse polarity and short circuit protection. Ignition protected (US Coast Guard 33 CFR 183.410).
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.