Alternator light glowing dimly

[James86004]

In May I did a dual battery install in our 92 Range Rover using a Blue Sea ACR. We just took a 7000 mile trip, using the refrigerator a lot, running the battery down to the low voltage cutoff a few times, and now the alternator light is glowing dimly. The alternator is putting out 14.75V measured across the battery posts, and there is a voltage drop of 0.02V between the alternator post and both battery + posts. There is less than that between the alternator case and the battery - posts. The alternator is a Delco 12SI which was rebuilt about a year ago. I think it used to put out closer to 13.8V.

Is it possible I fried a component by repeatedly charging a low battery?

James

 

[James86004]

The starting battery is a 4 year old Odyssey. It has 12.7 volts after letting the car sit overnight. Is there a way to test it? The only thing I know to do is look at the voltage drop when running the starter.

The house battery is a brand new Odyssey.

I spent some time yesterday checking out the wiring and didn't find anything amiss.

 

[228B]

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My advice regarding that battery type (I own them too) is to familiarize yourself with how that battery likes to be charged.
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Odyssey Battery Tech PDF w/ charge profile information
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Then invest in an EnerSys/Odyssey OMAX 50A 1B charger to "treat" each of those batteries, one at a time, when the vehicle is going to remain stationary for a day or two and you have "shore" power.

 

[bdog1]

Possible blown diode. Check for AC voltage "noise". Output will be reduced by 33%.


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