Disclaimer: This information is provided as an aid. It is correct to the best of our knowledge. Use it under your own risk.
* @ 80° F
Make sure to check after vehicle has been seating for at least 1 Hour to eliminate the presence of surface charge.
Place meter probe at accessory ground bolt or Body frame and top of battery negative post. With Key On engine off, load the system by turning on lights, high beam and blower motor on high speed. Voltage drop should not exceed 100Mv (0.100V)
Make sure to place meter probes on bolt and on top of battery post. This will insure test of battery cable and connections. Disable system to insure engine does not turn ON. Voltage drop during cranking should not exceed 200Mv (0.200V)
Place meter probe at the alternator’s output voltage bolt and the other at Battery positive post. With engine running load the system by turning ON lights, high beam and blower motor. Raise engine RPM to 2000 RPM. Voltage drop should not exceed 200Mv.
Engine running system loaded and engine at 2000 RPM
One end of the meter probe at starter positive cable bolt and the other probe at Battery positive post. Check while cranking. Should not exceed 0.200Mv.
Checking Battery Voltage Drop During Cranking
Minimum Battery Cranking Voltage