Using a 24v Battery Charger via the outside slave cable port

joesco · Mar 9, 2014

I have done a search and know this has been done before, but can't find specifics. I just purchased a NOCO Genius 12v/24v Smart Battery Charger / Maintainer and would like to charge / maintain (24v) my four Hawkers (installed in 2010 by Uncle Sam) via the slave port on the passenger side. I know I will need to purchase a male plug and wire it to my charger cables. My question.... has anyone done this? How do I wire it to the male plug (two wire??) and what gauge wire would I need. Thanks very much!

Squirt-Truck · Mar 9, 2014

Works great. Erick's sells the plugs, and just use the same size wire as on the charger. Be sure to get pos and neg correct.

joesco · Mar 9, 2014

Great, thanks. How do you distinguish between pos and neg on the male plug?

Squirt-Truck said:
Works great. Erick's sells the plugs, and just use the same size wire as on the charger. Be sure to get pos and neg correct.

Recovry4x4 · Mar 9, 2014

In a NATO plug, the center hole is positive while the surrounding part is negative.

joesco · Mar 9, 2014

Great thank you!

Recovry4x4 said:
In a NATO plug, the center hole is positive while the surrounding part is negative.

MWMULES · Mar 9, 2014

A G26000 will work through the Nato plug, a standard 24V charger would work also. A gen 4 bank charger with a set of wires to each battery would be better.

joesco · Mar 9, 2014

One more question.... being budget conscious, I found this connector online for short money. Are all NATO Slave Receptacles the same? My truck is a M931. HUMVEE NATO Slave Receptacle J-6362/U 24V Connector

doghead · Mar 9, 2014

Always confirm connections with a meter. I've seen the nato plug wired incorrectly on more than one truck!

joesco · Mar 9, 2014

Good point, will do Doghead. You are always watching my back buddy!!!

doghead said:
Always confirm connections with a meter. I've seen the nato plug wired incorrectly on more than one truck!

steelandcanvas · Mar 9, 2014

joesco said:
One more question.... being budget conscious, I found this connector online for short money. Are all NATO Slave Receptacles the same? My truck is a M931. HUMVEE NATO Slave Receptacle J-6362/U 24V Connector

Yes, all NATO (North Atlantic Treaty Organization) Slave Connectors are the same. This is standardized to work with all our allies in NATO.

MWMULES · Mar 9, 2014

That plug would work for dumb charging but not for slaving, low amp plug. Not all plugs are the same there are high and low amp plugs the J-6362/U 24V is low amp, if you hooked 2 of those up with cables and tried to slave a truck one end or the other would melt to the male plug.

joesco · Mar 10, 2014

Thanks, it will only be used for my new 24v charger / maintainer. Saw these slave plugs con the manufacturer's website for around $250.00, bought it new for $47.50!

joesco · Mar 18, 2014

See my pics below, installed today. The Humvee Nato (new $47.50) Slave Receptacle J-6362/U 24V came with a fused-in electrical power cord which would have plugged into a 24v charger. In about 5 minutes, I removed the screws on the back of the Receptacle, removed the power cord, and installed the my charger's cable (red to red, black to ground). I then plugged the new Receptacle into the side of the truck and using a multi-meter I tested the new charger's pigtail cable pins and it showed 24.8 volts coming off the batteries in the truck. So I knew my truck's Receptacle was wired and working correctly.

I plugged in my charger and set it to 24v Normal and it began conditioning and charging! Really neat, thanks for all the help on this guys!!!

Maverick1701 · Oct 4, 2014

joesco said:
See my pics below, installed today. The Humvee Nato (new $47.50) Slave Receptacle J-6362/U 24V came with a fused-in electrical power cord which would have plugged into a 24v charger. In about 5 minutes, I removed the screws on the back of the Receptacle, removed the power cord, and installed the my charger's cable (red to red, black to ground). I then plugged the new Receptacle into the side of the truck and using a multi-meter I tested the new charger's pigtail cable pins and it showed 24.8 volts coming off the batteries in the truck. So I knew my truck's Receptacle was wired and working correctly.

I plugged in my charger and set it to 24v Normal and it began conditioning and charging! Really neat, thanks for all the help on this guys!!!

Thanks for posting this thread. I am also looking for battery charging/maintaining options for my Jeep. I may end up copying this idea...only with the correct slave plug for my Jeep.

datadawg · May 29, 2017

MWMULES said:
A G26000 will work through the Nato plug, a standard 24V charger would work also. A gen 4 bank charger with a set of wires to each battery would be better.

Why would the GEN4 be better? You have to wire up each battery (more hassle) and according to their website, it's recommended only for battery maintenance, not charging (See the charging chart at bottom of page: https://no.co/g4)

The G26000 seems to offer more power and have additional versatility for civvy use (jump starting a dead battery), and with a NATO plug can be just as easily used to charge the 5 ton batteries. What am I missing?

NEIOWA · Oct 2, 2017

datadawg said:
Why would the GEN4 be better? You have to wire up each battery (more hassle) and according to their website, it's recommended only for battery maintenance, not charging (See the charging chart at bottom of page: https://no.co/g4)

The G26000 seems to offer more power and have additional versatility for civvy use (jump starting a dead battery), and with a NATO plug can be just as easily used to charge the 5 ton batteries. What am I missing?

Because you're testing/charging each battery individually based on it's condition.

Your option (plan B) is treating the battery bank as one big 24v battery which it is not. It is 4x 12v batteries interconnected. Can you correctly assume that all the batteries were identical in identical condition? Unlikely and they are $250ea Plan B works until it doesn't, at which time you won't know if plan A would have worked out better or not.

ericp351 · Dec 17, 2017

I think the truck alt.
treats system as a 24v battery,

ericp351 · Dec 17, 2017

Worked with many large battery system on ships to start stby diesel. Used one charger per battery bank. Not perfect, but worked well.

FloridaAKM · Dec 18, 2017

I charge my trucks by this method thru the slave port & have no problems with either the LMTV or the Deuces. Love the charger by the way, it is by far the best charger I own.

joesco said:
See my pics below, installed today. The Humvee Nato (new $47.50) Slave Receptacle J-6362/U 24V came with a fused-in electrical power cord which would have plugged into a 24v charger. In about 5 minutes, I removed the screws on the back of the Receptacle, removed the power cord, and installed the my charger's cable (red to red, black to ground). I then plugged the new Receptacle into the side of the truck and using a multi-meter I tested the new charger's pigtail cable pins and it showed 24.8 volts coming off the batteries in the truck. So I knew my truck's Receptacle was wired and working correctly.

I plugged in my charger and set it to 24v Normal and it began conditioning and charging! Really neat, thanks for all the help on this guys!!!

View attachment 483360 View attachment 483362 View attachment 483361

Using a 24v Battery Charger via the outside slave cable port

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