Voltage drop

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Coming in I went went to put my lower unit up and my voltage dropped from 13 to lower than 10 on my gauge and motor almost stalled ou…. 3.0 liter io mercruser…… 

[L&M]

Low battery issue if I were to guess. Load test the battery & check the actual alternator output with a meter, not the one on the dash. It should be in the area of 14.2 volts.

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Thanks hanks… will try that