Auto Meter SB-52 - Battery Load Test

APPENDIX
Check the electrolyte specic gravity with a
hydrometer. If the specic gravity measures
between 1.100 and 1.220, the battery must be
recharged. If the specic gravity is between 1.225
and 1.265, the battery is ok to test. If the hydrometer
has a temperature correction chart, be sure to adjust
the reading for the battery’s temperature.
Variance of specic gravity between cells is not
signicant on discharged batteries (batteries with
specic gravities below 1.225). However, if there is
a variance of 50 points (0.050) in a battery whose
specic gravity is 1225 or more, that battery is
defective.
NOTE: A defective battery must be replaced before
proceeding with any electrical system tests.
HYDROMETER METHOD
BATTERY LOAD TEST
1. Turn load knob to apply a load equal to 1/2 the Cold Crank rating or 3
times the Amp-Hour rating for 15 seconds.
2. Hold proper load for 15 seconds, observe the voltage reading, and
then immediately decrease the load until the fan stops and the
ammeter reads zero.
3. If the Voltmeter reads in the green zone for the approximate battery
temperature, the battery passed the load test (see example above).
If the Voltmeter reads in the red zone, replace the battery (see
example below). Use the battery Voltage Chart in Appendix B page
17 to compare test results.
NOTE: For Multiple Battery System Tests see Appendix C
WARNING: Be sure load is off before attaching or removing load clamps
to prevent arcing and potential explosion from bat tery gases. Always
shield eyes and keep sparks, ames or cig arettes away from batteries.
A
1
16
9