I have both a hydraulic dump trailer with two 12v batteries and an RV trailer with two 6v batteries to supply 12v. Both trailer's batteries are wired to be charged from the tow vehicle if the TV is equipped with a charge line.


Does the OEM 7 pin connector on a 2005 Ford 6.0 F250 CC 4X4 have a charging line on it?


If so which terminal / pin is it?


What gauge of wire is it and how much amperage will it deliver to the connector?


For testing, when is it hot? When the truck is running only? When the key is on? Is it hot all of the time?


Thanks, Bill

 

This should help.
The is the 06 diagram but other than
the fuses it should be the same and the
fuses will most likely be the same also.
But double check.

The charge line fuse looks to be a 20 amp one.
I would not push it past 75% of the total. 50%
would be better.

Sean

 

I have a dump trailer I use in construction also.
I was having issues with the batteries not holding their charge and I brought my trailer to a trailer shop and he chased it down to the 20 amp fuse. He said they go out all the time and he replaced it with a 30 amp....I know that might not be the best but since he did it I haven't had any issues....
Take it for what it's worth.

 

More than likely you have a popped fuse under the panel to the left of the steering column.
If I remember correctly the charge wire at the plug is hot only when the key is on. Keep this in mind when testing.

 

Charge line is hot on when key is on. If charge output seems weak, make sure you have a good ground trailer to truck. Unless you are running something pretty significant off the batteries, 20 amp should be more than ample.

Steve

 

Well, with two batteries on the dump trailer, the trailer needs to be hooked up to the truck and on, running a long time to fully fill two batteries. Depending on your use one battery might be better. Also, what alternator are you running? You may want to check fuses, but in addition, put the charger on the dump trailer once in a while, especially when you wanting to use it a lot in one day. Check that fuse often, I carry an assortment in the truck for these occasions.

 

This is the OP.


Thanks guys, this should take care of me. My problem on the dump trailer was that when I loaned the trailer to my brother all of his trucks were wired with a four pin connectors so he cut the seven pin off and there went the trailer brakes and the charging line. I'm putting things back together.


I now have where the fuse is located and which pin I need to test. Yes, I always keep a battery minder on it when it's not in use, it's just a matter of keeping the batteries charged when the trailer is hooked up to the truck. If I only get ten amps out of it, it will help.


On the travel trailer, because when it's being used away from electricity for charging, all I have is the truck (or generator) to charge it while moving. In trying to get the maximum charge from the truck to TT batteries, can I run a much heavier fused line from the truck batteries back to seven pin? I'd like to deliver an honest 20A or better to the TT.


I've put a heavier alternator on the truck. It's a 135A Bosch with the undersized 57 or 58mm pulley.


Bill

 

Gotta love family.

 

Yes, you can run as large a fused lead as you want, but be sure to remember to have a way to unplug it when you are camping or you will end up with a dead battery unless you are going to add a relay switched with the ignition.

Steve

 

If your getting lower voltage than you think you should
be getting one place to check is the harness side of that
plug. They sill get green fuzz from road water and salt.
So unhook the harness from the trailer plug on the truck
and have a look. Clean with contact cleaner and then add
some dielectric grease to protect it.


Sean

 

Sounds like your brother is a real piece of work to be cutting up your trailer like that

 

That would be the last time I ever loaned to anyone that did that.
Not even a thing that could not be hurt even with trying would get loaned.

Here are some photos for someone else but good to look at.
This is the plug and the back side where the green fuzz of death
tends to hide. Also you can see the screw in the one photo that
you have to remove to get the plug to come apart.


Also if your lucky you get one with a diagram on the cover.


7 pin hitch plug front




7 pin hitch plug back




7 pin hitch plug screw and connector when installed.



Sean