Little Harbor

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  1. Correction. Last line should read "the gauge is reading 180 degree."
  2. Using an infrared thermometer pointed to engine block right next to sender i read 171 degrees. What would be a good estimate for the difference between the block temperature and the adjacent coolant? My water temperature gauge is reading high and seems to be dependent on the input voltage. If I provide an independent battery (12.15 volts) with the battery ground tied in to the engine block ground the gauge reads 185. If i use the ships electrical system with alternator running (14.46 volts) I read 200 degrees . This happens with 3 different gauges. If the gauges are used on the generator system they all read correctly. This all happened after a 3 month boatyard haul out. Also when the voltage is read from sender post to ground post on the instrument I read 4.68 volts. When I take thee same voltage reading on my generator water temperature gauge I get the same reading, but the gauge is reading 280 degrees. Any ideas?