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You can unplug the cold start valve and check for voltage while cranking and with the engine cold. You should have battery voltage at the connector when starting and while running for a while.
If you don't have voltage, replace the over-voltage relay first, not just the fuse.
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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS
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