I did after a few times cranking it up and down. I bought a refurbished jack on ebay. Out come three bolts and dropped in the new jack. I found a wire on the tongue and it was 12 volt. Used it a few times before I decided to wire direct to battery ( seperate fuse at the battery! ). Not to hard to wire, with unit up more or less followed the other wiring from the tongue to the battery box. Used zip ties to anchor it and made sure to wrap it each time it went through a frame member cutout or could touch metal parts.
Three years later and no problems. I saw several on ebay for reasonable prices.
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