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Old 09-21-2012, 01:51 PM   #11
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Originally Posted by billclay2004lex View Post
OK I found the ground wire and put all three red wires and one with a fuse in it to the plus terminal of the battery! The 12 volt system works now but the fan on the converter box now runs all the time!
Your batteries are most likely VERY low and the converter is working overtime trying to charge them.
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Old 09-21-2012, 02:29 PM   #12
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That sounds about right. They could be very low depending on how long they sat on the shelf.

Just so you know, it might take very long for these batteries to get to a full state of charge (depending on how big they are).

If you wish, you can continue to try and charge through the converter/charger or use a good three-stage portable charger connected directly to the batteries.

I have two 6-volts that I prefer to charge this way rather than through the converter.
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Old 09-21-2012, 04:26 PM   #13
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With all of the college education in electronics on here, they have neglected to tell you the most important thing. "Don't lick bare wires."
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Old 09-21-2012, 04:26 PM   #14
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Thank You!
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Old 09-21-2012, 05:06 PM   #15
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Start engine and charge with alternator.
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Old 09-21-2012, 05:06 PM   #16
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works pretty quick or just drive around a little
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Old 09-21-2012, 05:08 PM   #17
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With all of the college education in electronics on here, they have neglected to tell you the most important thing. "Don't lick bare wires."
Haven,t done that in a long time. Have been an electrician since 1955. I only grab 440 volts with bare hands. Only once
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Old 09-21-2012, 05:14 PM   #18
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works pretty quick or just drive around a little
While you might think this works, you will never get more than 5 or 10% capacity replacement doing this. The voltage will mostly recover quickly but the capacity takes a lot of time.

Ignoring the tapering off of charging current as the voltage comes up (the alternator is a single stage charger) and say "on average" the alternator charges at an average 7 amps (if does NOT as on average it is MUCH less); it will take OVER 10 HOURS of "driving around" to charge up a 75 amp hour coach battery.

The physics is complicated but here are some charts to provide the visuals.
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Old 09-21-2012, 05:54 PM   #19
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I am now plugged in to 115 volts...should charge batteries by tomorrow?
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Old 09-21-2012, 07:44 PM   #20
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Originally Posted by billclay2004lex View Post
I am now plugged in to 115 volts...should charge batteries by tomorrow?
It has been my experience (using the capacity meter built into my TM-2025-RV battery monitor system) that over night on the converter will bring your battery up to about 90% capacity. It will take about 3 days on the converter (total) to bring it up to 100%.

This is due to the "Float Mode" of the converter reducing the charging amperage to less than 1 amp for the "top off" - Trickle Charge stage.
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