I have one that plugs into the outlet for my optimate charger. I can hide it out of the way under the seat. It has a long wire and is waterproof.
Saltyseafarer said:I use a Battery Tender ring terminal harness hooked up to my battery . . . . . Tucked under the seat makes battery maintenance easy
This plugs into the harness and makes an easy connection for GPS, cell phone whatever.
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This lays nicely in the tool tray with a Garmin GPS plug fed fwd and under the tank to a RAM mount. Neat, clean no splicing and the plugs take care of polarity.
The ring terminal harness and the Female Lighter Adapter was under $20 from Amazon.
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Exactly what I have. :D