My 2009 ML550 W164 M272) made it past 200000 miles today. Soon after the battery light came on while driving 150 miles into a 220 Mile trip. I made it home.
The Battery test stats added to the post… idle and load volts are low.
I'm wondering if this is a loose belt or indeed the alternator/regulator.
Do you have similar experience?
i could understand the alternator motor brushes finally wearing down.
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BATTERY TEST |
2025-08-31 | 07:29:56 PM |
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GOOD & RECHARGE |
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State of Charge: |
65% |
State of Health: 100% |
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Voltage: |
12.32 V |
Battery Type: |
FLOODED |
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Set Capacity: |
850 CCA/ SAE |
Measure Capacity: |
1032 CCA/SAE |
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SYSTEM TEST |
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11.06 V CRANKING VOLTS: |
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NORMAL |
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12.13 V ALT. IDLE VOLTS: |
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LOW |
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12.19 V ALT. LOAD VOLTS: |
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LOW |
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0.06 V |
DIODE RIPPLE: |
NORMAL |
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Did you check all your connections to make sure they were clean and tight?
