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Onboard battery charger shorts out when I plug it in

I have an onboard three-bank battery charger for my boat. I only have two batteries. When I plug in my charger it immediately shorts out. Could this be caused because the one bank is not connected to a battery and thus is an open circuit or should I look for another problem? If this is the probelm what can I do short of getting a third battery?

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  • Aaron Bleeker
    Aaron Bleeker May 11, 2010

    What brand and size charger do you have? How do you know that the charger is shorting out?

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Need third battery, Sensors are not indicating a load therefore short out occurs.

Posted on Oct 08, 2009

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Tip

How to Wire On-Board Marine Battery Chargers


Battery chargers are wired into a boat's electrical system. Wiring the charger to a battery switch permits the charging of the individual batteries or battery banks. The switch can be configured to charge both batteries or battery banks at once. Mounting the charger in the vessel keeps the charger where it will do the most good--connected to the batteries. This is useful if you are stuck with low batteries and need a recharge. Power from a generator, shore power or even AC power from another vessel can be used to get you going again

Instructions Things You'll Need:
Battery charger
Battery switch
Battery cable (sized)
Cable cutters
Razor knife
Battery terminal lugs
Lug crimper
Terminal kit
Terminal crimper
Hammer
Step 1

Mount the battery switch with the mounting kit provided by the manufacturer. The switch should be accessible but close to the battery or battery banks.
Step 2
Mount the battery charger in a location that will be accessible but protected from the elements. Mount the charger close to the battery switch to reduce the size of the charger leads.
Step 3
Connect the battery cables to the battery switch. Mount the battery cables onto their corresponding terminal studs on the battery switch.
Step 4
Lay out the battery positive cable from the charger to the switch and cut it to length with the cable cutters. Strip 3/4 inch of insulation from the cable ends with a razor knife. Splice the cable to the hot wire from the charger with a **** connector and the terminal crimper. Crimp a terminal lug onto the battery end of the cable with the lug crimper and a hammer. Connect the terminal lug at the battery switch positive output terminal.
Step 5
Lay out a battery cable from the charger to the battery negative terminal block. Cut the cable to length and strip 3/4 inch of insulation from the ends with a razor knife. Connect the battery negative cable to the charger negative power lead with a ****-splice and the terminal crimpers. Crimp a terminal lug onto the terminal block end of the cable with the lug crimper and a hammer. Connect the terminal lug at the battery negative terminal block post.

Tips & Warnings
Set the switch to "1," "2" or "both" to charge battery bank 1, bank 2 or both batteries at once.

on Jan 07, 2010 | Mercedes-Benz C230 Cars & Trucks

1 Answer

I have a dual marine battery charger on my boat that is wired thru a 1-2 or both switch both batteries are 12 v batteries and i was wanting to know if i could add another two 12v batteries to the sy


It sounds to me like you have an Ad-A-Battery system or something similar. Your dual battery charger has two sets of output leads. Those leads should be connected DIRECTLY as one set of leads to battery #1 and one set of leads to battery #2. Your 1-2-both switch should be OFF when you are charging. You will, I suspect, be supplying current to your motor and other boat circuits by having the switch on and running your charger through that switch. Adding two more batteries could be accomplished by buying a four battery charger (four sets of output leads) or buying a second dual battery charger. When you only want one AC plug-in you connect both charger AC inputs to a small junction box that is fed current by the AC plug-in. That will be nice and simple and safe. Of course, you need to check wire size to make sure you have proper size for the length of your wire runs.

Mar 10, 2013 | Marinco Guest 2620 Waterproof Charger

1 Answer

Is there fuses in the M91 Pronto Onboard charger


I had this exact same problem after having my M91 in the shop. The repair man said that the onboard charger was bad, so he sold me an offboard charger to charge through the arm. That didn't change anything. I finally took it apart myself and discovered that there was a cord leading from the onboard charger to the batteries that the repair person had left unplugged when he installed my new batteries.
What I'd thought was "fast draining" of the batteries was actually the batteries self-charging overnight (which they will do a little bit if you let them sit). Of course, this might not be your problem, but I'd say at least look at it as a possibility.

Aug 23, 2012 | Invacare Supply Group Invacare Pronto M91...

1 Answer

Hello, I have a Minn Kota 440 4 Bank Charger. I recently heard it spark when I plugged into my 115V AC power source. Since then I have no charging light indicator and no actual charging occuring. I tried...


Hello Brad / Colee

The voltage converter in the charger has gone out (violently). Do not use this charger in your craft anymore. There is no longer any kind of guarantee of isolation, and galvanic corrosion may be accelerated if the boat is sitting in the water and you try to charge batteries.

Replace the charger. Your craft and your lives aren't worth the risk. You can try contacting Minn Kota to see if there might be some kind of warranty assistance.

Aug 29, 2010 | Garmin Minn Kota MK 440 On-Board Charger...

1 Answer

Jassy 1103, will not start charging the battery.\r...


the 1103 uses an onboard charger. Charger's life span is about 3 years; some fail in 6 months, some in 6 years keep in mind. You can charge the 1103 using an offboard charger which are available for about $50.00 on Ebay. Search for electric wheelchair charger. You want one that has a 4 to 6 amp rating.

The offboard charger has a 3-prong connector on one end and the other plugs into a grounded wall outlet. Plug the charger into an outlet and the three prong connector into the female three prong connector located at the bottom front of the joystick. Give it a good overnight charge and it should be back up to snuff in the morning.

May 21, 2010 | Pride Jazzy 1103 Ultra Standard Power...

1 Answer

Should the onboard charger be plugged in 24/7?


I won't leave them on constantly. How about a timer for the onboard charger. Set it for 30 minutes a day. You get 3 1/2 hours a week and the batteries won't heat up.

Aug 06, 2009 | Boating

1 Answer

Boat battery charging issue


Hook up a differant bank and see if it says charged, check volts of battery must read 12.6 volts to be fully charged. If it dont bad battery
Jim OMC Retired Mech

Jul 01, 2009 | Boating

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