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Unread 11-09-2015, 12:14 PM   #1
Not Yet Wild
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Join Date: May 2015
Location: Chicago Suburbs
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Default Charger not turning on...

One of my kids left the ignition in the ON position. 2002 CC DS w/ IQ, 48V.

Batteries got drained (don't know if it was related). Here are the pieces to the puzzle:

1) Checked voltage across all batteries and get 24.6V. Each battery, checked independantely is about equal.
2) I plug in the charger, and get absolutely nothing. No click, no hum, nothing.
3) My volt reducer 48->12V system won't even turn on the headlights or turn on my LED voltage meter.
4) Water level in batteries is good.
5) When I flip the switch to reverse, I get the buzzing sound. No click on solenoid when gas pedal is depressed though.
6) Batteries were replaced new on 8/14

I have read a few things on the forum that the powercharger unit will not turn on if the full battery pack is too low. Assuming this to be the case (I can't find what threshold it looks for), how do I charge each individual battery? Buy an 8 volt charger? Do I disconnect each battery from the others and charge them seperatly or can I leave them all hooked up and charge each at their own terminal?
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Unread 11-09-2015, 01:00 PM   #2
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Location: Charlotte, NC
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Default Re: Charger not turning on...

The pack voltage is too low for the regular charger to work.

You do not have to disconnected any cables in order to charge each battery individually, You just need to place the charger Positive and Negative leads directly to each battery positive and negative posts.

Assuming Your 12v car charger will turn on at less than 8v, set it to 2 Amps and charge each battery individually.

It would be best to have a voltmeter connected to the battery as well so You can disconnect the 12v charger when it reaches 10v on each 8v battery.

After that You will need to plug the regular charger and let it finish its cycle.

You should then reboot the OBC by disconnecting the pack negative cable for more than 10 minutes.

Run another charge cycle after You plug the pack back so the OBC can get another profile on the state of charge of the batteries.
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Unread 11-09-2015, 05:34 PM   #3
Not Yet Wild
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Default Re: Charger not turning on...

thank you sergio!
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