2.
Conduct a hydrometer test of the battery electrolyte.
A. Check the voltage across the battery terminals
prior to testing the battery. If the voltage is less than
IMPORTANT: Make sure the area around the cells is
clean before opening the battery caps.
12.4
VDC, recharge the battery.
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 for 10 seconds to remove battery surface
charge. Reconnect the fuel stop solenoid.
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.
B. Temperature correct each cell reading. For each
C. Make surebattery terminals arefreeofcorrosion.
10
specific gravity reading. For each 10oF (5.5oC) be-
oF (5.5oC) above 80oF (26.7oC) add 0.004 to the
D. Measure the temperature of the center battery
cell.
low 80oF (26.7oC) subtract 0.004 from the specific
gravity reading.
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.
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)
F. Applyatestloadof270amps(onehalftheCrank-
ing Performance rating of the battery) for 15 se-
conds.
ADD (conversion above)
Correction to 80oF (26.7oC)
0.008
1.253
G. Take a voltage reading after 15 seconds, then re-
move the load.
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 Charging or until specific gravity of all cells is
H. Using the table below, determine the minimum
voltage for the cell temperature reading:
1.225
orgreater withthedifferenceinspecificgravity
between the highest and lowest cell less than 0.050.
If these charging conditions 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)
60oF
21.1oC (and up)
15.6oC
3.
Perform a high--discharge test with an adjustable
load tester.
50oF
40oF
10.0oC
4.4oC
Thisisoneofthemostreliablemeansoftestingabattery
asitsimulatesthecold--crankingtest.Acommercialbat-
tery load tester is required to perform this test.
30oF
20oF
10oF
0oF
--1.1oC
--6.7oC
--12.2oC
--17.8oC
CAUTION
I. If the test voltage is below the minimum, replace
the battery. If the test voltage is at or above the mini-
mum, return the battery to service.
Follow the battery load tester manufacturer’s
instructions when using a battery load tester.
Electrical System
Page 5 -- 14
ProCore Processor
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