Micro 420 Battery Tester

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

The Micro 420 automotive battery tester is designed to help the dealership technicians diagnose the cause of a defective battery. Follow the instruction manual supplied with the tester to properly diagnose a vehicle. If the instruction manual is not available refer to the standard procedure in this article, which includes the directions for using the Micro 420 battery tester.

BATTERY SYSTEM DIAGNOSIS
CONDITION	POSSIBLE CAUSES	CORRECTION
THE BATTERY SEEMS WEAK OR DEAD WHEN ATTEMPTING TO START THE ENGINE.	1. The battery has an incorrect size or rating for this vehicle.	1. Refer to BATTERY SPECIFICATIONS for the proper size and rating. Replace an incorrect battery, as required.
	2. The battery is physically damaged.	2. Inspect the battery for loose terminal posts or a cracked and leaking case. Replace the damaged battery, as required.
	3. The battery terminal connections are loose or corroded.	3. Refer to BATTERY CABLES for the proper cable diagnosis and testing procedures. Clean and tighten the battery terminal connections, as required.
	4. The battery is discharged.	4. Determine the battery state-of-charge. Refer to STANDARD PROCEDURE for the proper test procedures. Charge the faulty battery, as required.
	5. The electrical system ignition-off draw is excessive.	5. Refer to STANDARD PROCEDURE for the proper test procedures. Repair the faulty electrical system, as required.
	6. The battery is faulty.	6. Determine the battery cranking capacity. Refer to STANDARD PROCEDURE for the test procedures. Replace the faulty battery, as required.
	7. The starting system is faulty.	7. Determine if the starting system is performing to specifications. Refer to STARTING - EXCEPT COUPE for the proper starting system diagnosis and testing procedures. Repair the faulty starting system, as required.
	8. The charging system is faulty.	8. Determine if the charging system is performing to specifications. Refer to CHARGING - EXCEPT COUPE for the proper charging system diagnosis and testing procedures. Repair the faulty charging system, as required.
THE BATTERY STATE OF CHARGE CANNOT BE MAINTAINED.	1. The battery has an incorrect size or rating for this vehicle.	1. Refer to BATTERY SPECIFICATIONS for the proper specifications. Replace an incorrect battery, as required.
	2. The battery terminal connections are loose or corroded.	2. Refer to BATTERY CABLES for the proper cable diagnosis and testing procedures. Clean and tighten the battery terminal connections, as required.
	3. The generator drive belt is slipping.	3. Refer to COOLING - EXCEPT COUPE for the proper accessory drive belt diagnosis and testing procedures. Replace or adjust the faulty generator drive belt, as required.
	4. The electrical system ignition-off draw is excessive.	4. Refer to STANDARD PROCEDURE for the proper test procedures. Repair the faulty electrical system, as required.
	5. The battery is faulty.	5. Determine the battery cranking capacity. Refer to STANDARD PROCEDURE for the proper test procedures. Replace the faulty battery, as required.
	6. The starting system is faulty.	6. Determine if the starting system is performing to specifications. Refer to STARTING - EXCEPT COUPE for the proper starting system diagnosis and testing procedures. Repair the faulty starting system, as required.
	7. The charging system is faulty.	7. Determine if the charging system is performing to specifications. Refer to CHARGING - EXCEPT COUPE for the proper charging system diagnosis and testing procedures. Repair the faulty charging system, as required.
	8. Electrical loads exceed the output of the charging system.	8. Inspect the vehicle for aftermarket electrical equipment which might cause excessive electrical loads.
	9. Slow driving or prolonged idling with high-amperage draw systems in use.	9. Advise the vehicle operator, as required.
THE BATTERY WILL NOT ACCEPT A CHARGE.	1. The battery is faulty.	1. Refer to STANDARD PROCEDURE for the proper battery charging procedures. Charge or replace the faulty battery, as required.