2004 John Deer Buck Utility ATV 500, 500EX and 500EXT Service Manual, Page 154Get this manual
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Temperature below 21C (70F): Hydrometer reading: 1.250 Electrolyte temperature: -1C (30F) Subtract 0.016 SpGrCorrected SpGris 1.234
Remove seatDisconnect negative BLACK cable first then positive