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Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
MAINTENANCE
Owner’s Guide
113
Hydrometer Temperature
Correction
°F °C
160 71
150 65
140 60
130 54
120 49
110 43
100 37
90 32
80 26
70 21
60 15
50 10
40 4
30 -1
20 -6
10 -12
+.032
+.028
+.024
+.020
+.016
+.012
+.008
+.004
0
-.004
-.008
-.012
-.016
-.020
-.024
-.028
+.030
+.026
+.022
+.018
+.014
+.010
+.006
+.002
-.002
-.006
-.010
-.014
-.018
-.022
-.026
EXAMPLE #1
ELECTROLYTE TEMPERATURE
Above 80 °F (27 °C)
AMBIENT TEMPERATURE
Above 80 °F (27 °C)
ELECTROLYTE TEMPERATURE
Above 90 °F (32 °C)
HYDROMETER READING 1.250
1.250 + .004 = 1.254
CORRECTED SPECIFIC GRAVITY
READING
EXAMPLE #2
ELECTROLYTE TEMPERATURE
Above 80 °F (27 °C)
AMBIENT TEMPERATURE
Above 80 °F (27 °C)
ELECTROLYTE TEMPERATURE
Above 70 °F (21 °C)
HYDROMETER READING 1.250
1.250 - .004 = 1.246
CORRECTED SPECIFIC GRAVITY
READING
ELECTROLYTE
TEMPERATURE
reading indicates a specific gravity of 1.250 and the electrolyte
temperature is 90° F (2° 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.
Battery Charger Maintenance
Connect the charger plug into the vehicle receptacle and wait for the
relay to activate. Move the plug back and forth in the receptacle.
If the charger turns off, check the plug for a broken red wire in the DC cord.