Battery Testing
Conduct a hydrometer test of the battery electrolyte.
B. If the battery has recently been charged, remove
the battery surface charge before performing the
loadtest.Disconnect theengine fuelstopsolenoidto
prevent the engine from starting. Engage the starter
motor forten (10) seconds toremove battery surface
charge. Reconnect the fuel stop solenoid.
1.
IMPORTANT: Make sure the area around the cells is
clean before opening the battery caps.
A. Measure the specific gravity of each cell with a
hydrometer. Draw electrolyte in and out of the
hydrometer barrel prior to taking a reading to warm--
up the hydrometer. At the same time take the tem-
perature of the cell.
C. Make surebattery terminals arefreeofcorrosion.
D. Measure the temperature of the center battery
cell.
E. Connect a battery load tester to the battery termi-
nals following the load tester manufacturer’s in-
structions. Connect a digital multimeter to the
battery terminals.
B. Temperature correct each cell reading. For each
10
oF (5.5oC) above 80oF (26.7oC) add 0.004 to the
specific gravity reading. For each 10oF (5.5oC) be-
low 80oF (26.7oC) subtract 0.004 from the specific
gravity reading.
F. Applyatestloadof295amps(onehalftheCrank-
ing Performance rating of the battery) for 15 se-
conds.
Example: Cell Temperature
Cell Gravity
100oF
1.245
100
(37.7
20
(11
oF minus 80oF equals 20oF
oC minus 26.7oC equals 11.0oC)
oF multiply by 0.004/10oF equals 0.008
oC multiply by 0.004/5.5oC equals 0.008)
G. Take a battery voltage reading after 15 seconds,
then remove the load.
H. Using the table below, determine the minimum
voltage for the cell temperature reading:
ADD (conversion above)
Correction to 80oF (26.7oC)
0.008
1.253
C. If the difference between the highest and lowest
cell specific gravity is 0.050 or greater or the lowest
cellspecificgravityislessthan1.225,chargethebat-
tery. Charge at the recommended rate and time giv-
en in Battery Charging in this section or until
specific gravity of all cells is 1.225 or greater with the
differenceinspecificgravitybetweenthehighestand
lowest cell less than 0.050. If these charging condi-
tions can not be met, replace the battery.
Minimum
Voltage
Battery Electrolyte
Temperature
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
70oF (and up)
21oC (and up)
60oF
50oF
16oC
10oC
4oC
40oF
30oF
20oF
--1oC
--7oC
--12oC
--18oC
2.
Perform a high--discharge test with an adjustable
load tester.
10oF
0oF
Thisisoneofthemostreliablemeansoftestingabattery
asitsimulatesthecold--crankingtest.Acommercialbat-
tery load tester is required to perform this test.
I. Ifthetestvoltageisbelowtheminimum voltagein
the chart, replace the battery. If the test voltage is at
or above the minimum, return the battery to service.
CAUTION
Follow the battery load tester manufacturer’s
instructions when using a battery load tester.
A. Check the voltage across the battery terminals
prior to testing the battery. If the voltage is less than
12.4
VDC, charge the battery (see battery charging
in this section).
Electrical System
Page 5 -- 46
Groundsmaster 4300--D
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