Midtronics RIVIAN CPX-900

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Appendix B:Test Results Decision Tables
CPX-900
29
Alternator Test Results (Non-RIVIAN Vehicles)
Decision Action
Charging
Normal
The output from the alternator is normal.
No Output
No output detected. Check belts to ensure alternator is rotating when engine is running.
√ Check all alternator connections including to the battery. Clean or replace if necessary and
retest.
√ If the belts and connections are in good working condition, replace alternator or external voltage
regulator.
Low Output
Alternator not providing enough current to power electrical loads and charge the battery.
√ Check belts to ensure the alternator is rotating with the engine running.
√ Check alternator connections to and from the battery. If loose or heavily corroded, clean or
replace the cable and retest.
High
Output
Alternator voltage to the battery exceeds normal limits of a functioning regulator.
√ Check for loose and normal ground connections. If no connection problems are found, replace
the regulator.
The normal high limit of a typical automotive regulator is 14.5 volts +/–0.5. Refer to the manufacturer
specications for the correct limit, which may vary by vehicle type.