Battery Testing
Conduct a hydrometer test of the battery electrolyte:
C. If the battery has been charged, apply a 150 amp
load for 15 seconds to remove the surface charge.
Use a battery load tester following the manufactur-
er’s instructions.
1.
IMPORTANT: Make sure the area around the cells is
clean before opening the battery caps.
D. Measure the temperature of the electrolyte in the
center cell.
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.
E. Connect a battery load tester to the battery termi-
nals following the manufacturer’s instructions.
Connect a digital multimeter to the battery terminals.
F. Applyatestloadof150amps(onehalftheCrank-
ing Performance) for 15 seconds.
B. Temperature correct each cell reading. For each
10
o
F (5.5
specificgravityreading.Foreach10
F (26.7 C) subtract 0.004 from the specific grav-
ity reading.
o
C) above 80
o
F (26.7
o
C) add 0.004 to the
o o
F(5.5 C)below
G. Take a battery voltage reading at 15 seconds,
then remove the load. Record this test voltage read-
ing.
80
o
o
Example:
Cell Temperature
Cell Gravity
ADD (20o above 80oF)
Correction to 80oF
100oF
H. Using the table below, determine the minimum
test voltage for the cell temperature reading.
1.245
0.008
1.253
Minimum
Test Voltage
Battery Electrolyte
Temperature
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 all cells specific gravity is
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
70
o
F (and up)
21.1 C (and up)
o
60
50
40
30
20
10
o
F
o
F
o
F
o
F
o
F
o
F
15.6
10.0
o
C
C
o
1.225
orgreater withthedifferenceinspecificgravity
4.4
--1.1
--6.7
o
C
between the highest and lowest cell less than 0.050.
If these charging conditions can not be met, replace
the battery.
o
C
o
C
--12.2
--17.8
o
C
C
2.
Perform a high--discharge test with an adjustable
0 F
o
o
load tester.
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.
Thisisoneofthemostreliablemeansoftestingabattery
asitsimulatesthecold--crankingtest.Acommercialbat-
tery load tester is required to perform this test.
CAUTION
Follow the battery load tester manufacturer’s
instructions when using a load tester.
A. Check the voltage across the battery terminals
prior to testing the battery. If the voltage is less than
12.0
VDC, recharge the battery before load testing.
B. Make sure the battery terminals are free of corro-
sion.
Workman MD/MDX
Page 6 -- 27
Electrical System
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