Alternator Output Too High?

[chicaria]

The alternator on my 06 Ram 1500 5.7 Hemi gives a reading of 15 V at idle. What is the normal range of voltage output for an alternator? I also have an issue with battery drain, could the battery drain and the voltage output of the alternator be related? Thanks.

 

[lpennock]

What is the outside temp. With temperature compensated charging 15v isn't high at 20 degrees.

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[Scottly]

If the battery has a shorted plate internally, it will "drain" and will also cause the alternator output to be too high. Install a new battery and test the charging system. DO NOT test the system with the existing battery as your readings will not be correct.

 

[chicaria]

Outside temps are low 40's during the day and above freezing at night. I did the testing late mornings and early afternoon. I'm working with my second new battery. All fuses and lightbulbs are good.

 

[turkeybird56]

^^^^^^^^^^^^^ Check for a Bad Ground Also... (specifically ground points and Neg battery cable). Feel the cables (both) and see if U feel any really warm/hot spots. A bad cable cause that issue also.................U could also besides feeling cable run a probe and see if U get any readings on cable (12V tester)