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Subaru alternator vs. Battery divisor
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Old 19 Mar 2010, 12:19 PM   #1 (permalink)
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Subaru alternator vs. Battery divisor

I'm working on a electrical project for a Impreza gl 1993 1.8, and I'm experiencing some weird beavior, at least, compared to other cars I've done the same setup.

This Impreza is using a two battery system, both separated by a marine battery divisor (as shown in the drawing). These batteries are fed by a custom high amp alternator, built using a stock Impreza alternator.

The issue is, when I start the car, the alternator doesn't feed the batteries. It only starts feeding them if I give it a little "help", using a paralell cirtcuit to conect pin 1 and 2 of the divisor for just a second, giving the alternator the "impression" that the battery is directly attached to it.

The paralell circuit is a single 15W 1.5 OHM resistor. The alternator is a 14.4v 130AMP alternator, and the battery divisor consists of two paralells 50v 80 AMP diodes...

So, I got a lot of questions, but have to start with the most obvious one... Does the impreza's alternator have any kind of reverse current/voltage sensor that requires it to be connected straight to the battery (without a diode on the path)?

Plus, if I give it the little help, both battery are perfectly charged, so the alternator is working fine.

Thanks for the help.
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