Dual on-board Battery Charger
output?
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Posted on Tuesday Aug 5, 2014 at 8:05 PM  
Shouldn't my on board charger show an output of 12 VDC when disconnected from the Batteries?  It is humming when plugged in.  When I hook the Multi-meter up in the 200 VDC mode it reads zero????  Am I missing something?
Posted on Tuesday Aug 5, 2014 at 9:39 PM  
A lot of battery chargers do not turn on when they are not connected to a battery.  What is the voltage on the battery when the charger is hooked up and plugged in?  Most on board chargers will ramp up to 13.5 to 15.5 volts and go back to a "float" mode at full charge and read about 12.6 volts. They will turn back on around 12.45 volts to maintain a charge.  You can force a recharge for testing by disconnecting the charger for a few seconds. 
Posted on Wednesday Aug 6, 2014 at 9:00 AM  
Thanks B James for the help.  I went back out and hooked up a low Battery to take a reading.  The Battery originally showed 8.0 VDC.  After connecting both Banks of the Charger, the VDC did not increase at all.  Still read 8.0 VDC.  The Charger is humming.  Can I assume the Charger is not working correctly?  I wonder if there is a fuse for output to the Batteries, etc?  All help is appreciated.
Posted on Wednesday Aug 6, 2014 at 9:55 PM  
On Wednesday Aug 6, 2014 at 9:00 AM grizlyadams said ...
Thanks B James for the help.  I went back out and hooked up a low Battery to take a reading.  The Battery originally showed 8.0 VDC.  After connecting both Banks of the Charger, the VDC did not increase at all.  Still read 8.0 VDC.  The Charger is humming.  Can I assume the Charger is not working correctly?  I wonder if there is a fuse for output to the Batteries, etc?  All help is appreciated.
Google your brand and model number and you should be able to find the manual for it. It should have a trouble shooting section in it to tell you if it has fuses. I have one charger with in line fuses and one with protection built in.
Posted on Wednesday Aug 6, 2014 at 11:37 PM  
On Wednesday Aug 6, 2014 at 9:00 AM grizlyadams said ...
...I went back out and hooked up a low Battery to take a reading.  The Battery originally showed 8.0 VDC.  After connecting both Banks of the Charger..
"....After connecting both banks of the charger..." makes me ask the question: "Do you have a dual bank charger and did you connect both sets of outputs to the same battery?".  If you did, that might explain the humming - as both sets of chargers might be fighting each other.  What model charger do you have? If you can't get anywhere with it, give me a buzz. 
The more you practice, the luckier you get.
Posted on Thursday Aug 7, 2014 at 8:44 AM  
Thanks James and Dan.  No, I didn't hook up both sides to the same Battery.  I have the Dual Pro, 2003 model.  Its a completely sealed unit.  I called the maker and here's what they said. "If the Battery is too low, the Charger will not charge at all, you must connect a separate Battery Charger to bring it up above 5 to 8 VDC".  This sounds like Hogwash to me.  I have another boat with almost the same Charger and it works with very low Batteries.

Anyway, it appears that this Charger is bad. I tried it in all different ways.  I hooked up 1 Battery to 1 side, 2 batteries(1 on each), 2 low batteries and 2 known good Batteries.  Still the same results, No Ouput from Charger.  The multiple red lights come on very dim and do not blink.  The Charger does  hum though.  

I guess its time to buy a new one.
Posted on Thursday Aug 7, 2014 at 9:00 AM  
Dim lights and buzzing sounds like a wire is shorted or low voltage.  Look for signs of a pinched wire to the batteries and make sure the extension cord to your 110v is good and the power at the outlet is ok.
Posted on Thursday Aug 7, 2014 at 11:03 AM  
That's a real nice charger. I have a Dual Pro also. I fried mine a couple years ago. I unplugged the cord, tossed it in the battery compartment, and left not realizing the plug's ground prong came to rest upon the Positive post of the battery. Sent hundreds of amps down the cord's ground wire inside the cable, turning it into a glowing 6ft wand. Filled the motel parking lot with smoke. It was an exciting time that proved my tagline quote.

Anyway, I shipped it back to the manufacturer and they repaired it for a nominal fee that made it well worth it. Not sure if my owners manual page on LED indicators applies to your unit, but here it is in case it helps.   


The more you practice, the luckier you get.
Posted on Thursday Aug 7, 2014 at 4:00 PM  
Thanks again guys.  I will check the connection on the plug and all wires leading to the Charger for proper connection, etc.  Will let you know if I find anything.  There is a made up extension to allow extra length on the Charging Cord, that will be my first check.  I will hook the power directly to the Charger Cord first off too.

Thanks
Posted on Thursday Aug 7, 2014 at 5:11 PM  
Ok, just went out and checked all connections.  The home made extension portion checked good.  110 in 110 out.  I removed the Charger from the Boat and hooked it directly to an AC plug, still the same.  There must be something internal going wrong.  Red lights still come on very dim and do not increase or flash, etc.  I wish I could take it apart and see the inside.  It appears to be sealed.  I wonder if a heat gun would release the seal....

Anyone have a Dual Charger for sale?
Posted on Thursday Aug 7, 2014 at 11:07 PM  
On Thursday Aug 7, 2014 at 5:11 PM grizlyadams said ...
I wish I could take it apart and see the inside.  It appears to be sealed.  I wonder if a heat gun would release the seal...
Mine was sealed up with a rubbery / black silicon substance. When I took mine apart and it did not require a heat gun. I don't remember it being a challenge to take apart, other than dealing with alot of the black rubbery stuff.  There were things that could be reseated in mine. Get in there and see if you can find something charred, loose, or needing reconnecting. 
The more you practice, the luckier you get.
Posted on Friday Aug 8, 2014 at 11:19 AM  
Thanks Dan, I will give it a try.  I did pry on it a little yesterday with a Screwdriver and found out the cover is Plastic (it cracked).  Will try another method later on today.
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