The ACR wont auto-connect the second battery to the main battery if the second battery is below a certain voltage. Hence no charge to second battery. I think its less than 11 or 10? Cant remember.
8.8 will definitely not work.
Sometimes you can fake out the ACR by putting jumper cables or a jump pack onto the low secondary battery while the primary battery is being charged by the power source (battery charger, outboard, alternator etc).
Once the ACR sees that the secondary battery is in a good enough state to charge it will auto-connect, and if you let it charge for awhile should come right back up (as long as the battery is ok).
You can hear the ACR make an audible click when it connects the two batteries.
Also the LED on the front of the ACR will clue you in to what its doing.
I think triple flash means auto disconnect due to low voltage.
While the outboard is running you can check the output of the stator at the battery or the starter. See if you've got 13 volts plus.
Then check at the back of the ACR. Should have charge voltage on one side, and then when the ACR connects charge voltage on the second side.
The ACR is essentially just a solenoid switch so no real chance of it killing the battery or anything.
Also check the ground wire to the ACR.
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Zachary
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