Battery Load Test

Load 50% Of Cold Cranking Rating:

Load Test Voltage-Temperature:

DESCRIPTION
A battery load test will verify the actual cranking performance based on the cold crank rating of the battery.

WARNING: If battery shows signs of freezing, leaking, loose posts, or excessively low electrolyte level, do not test. Acid burns or explosive condition may result.

Before performing the battery load test, the battery must be FULLY CHARGED.

TEST PROCEDURE
1. Remove both battery cables, negative first. Battery top and posts should be clean. If green dot is not visible in indicator, charge the battery, see Battery Charging Procedures in this section.

2. Connect a suitable Volt-Ammeter-Load tester to the battery posts. Refer to operating instructions provided with the tester being used. Check the open circuit voltage (no load) of the battery. Voltage should be equal to or greater than 12.4 volts with green dot visible in test indicator.

3. Rotate the load control knob (Carbon pile rheostat) to apply a 300 amp load for 15 seconds then control knob to off. This will remove the surface charge from the battery.

4. Allow the battery to stabilize for 15 seconds, verify open circuit voltage.

5. Rotate the load control knob to maintain a load (50% of cold crank rating-see specifications) for a minimum 15 seconds. After 15 seconds, record the (loaded) voltage reading and return the load control to off.

6. Voltage drop will vary according to battery temperature at the time of the load test. Battery temperature can be estimated by the temperature of exposure over the preceding several hours. If the battery has been charged, boosted, or loaded a few minutes prior to test, the battery would be somewhat warmer. Refer to Load Test Temperature chart for proper loaded voltage reading.

7. If battery passes load test, it is in good condition. No further tests are necessary. If it fails load test, it should be replaced.