Battery Load Test

Battery Caution Label:

^ Load testing requires use of battery side terminal adapters (AC Delco part number ST-1201 GM part number 12303040 or equivalent) to ensure good connections. Do not load test a frozen battery. Replace it instead.
A. Use a voltmeter to check voltage across terminals. With all loads off, and green dot showing in hydrometer (Step 2), voltage should be, 12 volts or higher. If not, replace the battery.
B. With voltmeter still attached, connect a battery load tester across the battery terminals.
C. If battery has been on charge, apply a 300 ampere load for 15 seconds to remove surface charge from the battery. Remove load. (Do not complete this step if battery has not been recently charged).
D. Wait 15 seconds to let battery recover. Apply specified load located on battery label or refer to Specifications. Read voltage after 15 seconds, then remove load.

Battery Temperature Vs Voltage Drop:

E. If voltage does not drop below the minimum listed, the battery is good and should be returned to service. (The battery temperature must be estimated by feel and by the temperature the battery has been exposed to for the proceeding few hours).
F. If voltage drops below the minimum listed, replace the battery.