E-Z-GO Express S4 - Electric Owner Manual - Page 71
Using A Hydrometer, BATTERY CHARGER MAINTENANCE
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MAINTENANCE Read all of this manual to become thoroughly familiar with this vehicle. Pay particular attention to all Notices, Cautions, Warnings, and Dangers. Using A Hydrometer 1. Draw electrolyte into the hydrometer several times to permit the thermometer to adjust to the electrolyte temperature and note the reading. Examine the color of the electrolyte. A brown or gray coloration indicates a problem with the battery and is a sign that the battery is nearing the end of its life. 2. Draw the minimum quantity of electrolyte into the hydrometer to permit the float to float freely without contacting the top or bottom of the cylinder. 3. Hold the hydrometer in a vertical position at eye level and note the reading where the electrolyte meets the scale on the float. 5 4. Add or subtract four points (.004) to the reading for every 10° F (6° C) the electrolyte temperature is above or be- low 80° F (27° C). Adjust the reading to conform with the electrolyte temperature, e.g., if the reading indicates a specific gravity of 1.250 and the electrolyte temperature is 90° F (32° C), add four points (.004) to the 1.250 which gives a corrected reading of 1.254. Similarly if the temperature was 70° F (21° C), subtract four points (.004) from the 1.250 to give a corrected reading of 1.246. 5. Test each cell and note the readings (corrected to 80° F or 27° C). A variation of fifty points between any two cell readings (example 1.250 - 1.200) indicates a problem with the low reading cell(s). As a battery ages the specific gravity of the electrolyte will decrease at full charge. This is not a reason to replace the battery providing all cells are within fifty points of each other. Since the hydrometer test is in response to a vehicle exhibiting a performance problem, the vehicle should be recharged and the test repeated. If the results indicate a weak cell, the battery or batteries should be removed and replaced with a good battery of the same brand, type and approximate age. Hydrometer Temperature Correction BATTERY CHARGER MAINTENANCE Plug charger into vehicle receptacle and wait for relay to turn on. Check to see if charger turns off by moving plug back and forth in receptacle. If charger does turn off, check plug for a broken red wire in DC cord. 5 - 21