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Battery and alternator testing?

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Old Jun 17, 2019 | 09:26 AM
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thx997303
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Battery and alternator testing?

I've noticed that my battery voltage while driving seems to be on the low side, seems to hang around 13.2 to 13.4 volts, but yesterday it was dropping down to 12.9 while driving on the freeway.

I'm going to clean all battery connections, and pull and load test the batteries, but how do I go about testing the alternator?
 
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Old Jun 17, 2019 | 11:51 AM
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seville009
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My batteries will be around 13 when driving many times; not abnormal.

Test them when they’re off; if they’re not close to 12.6, then I would check other stuff
 
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