Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMAZDA2006B4000 BASE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE SYMPTOM TROUBLESHOOTING - (5 OF 5)SYMPTOM TROUBLESHOOTING CHART - CHARGING SYSTEMNOTES

2006 Mazda B4000 Base, Automatic

Symptom Troubleshooting Chart - Charging System: Notes

2006 Mazda B4000 Base, AutomaticSECTION Notes

SYMPTOM TROUBLESHOOTING CHART - CHARGING SYSTEM

Symptom Troubleshooting Chart - Charging System
Problem	Possible Cause	Action
Battery is Discharged or Battery Voltage is Low	Circuitry High key-off current drain(s) Battery Generator	See CHARGING SYSTEM PINPOINT TEST 1: BATTERY IS DISCHARGED OR BATTERY VOLTAGE IS LOW
Charging System Warning Indicator is ON with the Engine Running (The Charging System Voltage Does Not Increase)	Circuitry Generator	See CHARGING SYSTEM PINPOINT TEST 2: CHARGING SYSTEM WARNING INDICATOR IS ON WITH THE ENGINE RUNNING (CHARGING SYSTEM VOLTAGE DOES NOT INCREASE) .
Charging System Overcharges (Battery Voltage Greater Than 15.5 Volts)	Circuitry Generator	See CHARGING SYSTEM PINPOINT TEST 3: CHARGING SYSTEM OVERCHARGES (BATTERY VOLTAGE IS GREATER THAN 15.5 VOLTS) .
Charging System Warning Indicator is ON with the Engine Running and the Battery Voltage Increases	Circuitry Instrument Cluster Generator	See CHARGING SYSTEM PINPOINT TEST 4: CHARGING SYSTEM WARNING INDICATOR IS ON WITH THE ENGINE RUNNING AND THE BATTERY INCREASES VOLTAGE .
Charging System Warning Indicator is OFF with the Ignition Switch in the RUN Position and the Engine OFF	Bulb Circuitry Instrument Cluster Generator	See CHARGING SYSTEM PINPOINT TEST 5: CHARGING SYSTEM WARNING INDICATOR IS OFF WITH THE IGNITION SWITCH IN THE RUN POSITION AND THE ENGINE OFF .
Charging System Warning Indicator Flickers or is Intermittent	Smart junction box (SJB) fuse 10 (10A) Generator connector unplugged (A-168) Circuitry Generator	See CHARGING SYSTEM PINPOINT TEST 6: CHARGING SYSTEM WARNING INDICATOR FLICKERS OR IS INTERMITTENT .
Generator is Noisy	Bolts or brackets Drive belt Generator or pulley	See CHARGING SYSTEM PINPOINT TEST 7: GENERATOR IS NOISY .
Radio Interference	Generator Circuitry In-vehicle entertainment system	See CHARGING SYSTEM PINPOINT TEST 8: RADIO INTERFERENCE .

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.