Anybody ever connect an external battery?

I installed 2 size 31 deep cycle batteries in the bed of the truck when the camper is off they connect to the truck electrical system ,when the camper is on they connect into the camper battery. the truck connection connects to a relay and charges the 3 camper batteries .If would like a wiring diagram and pictures I will send them to you .anyone else who would like pictures can contact me at email tbltony.barra@gmail.com tblmarine electrical .

You are right that using electronic colder with flux with it makes it easier.
Also most of the cables I am dealing with are older and have copper corroded, what require cleaning for good soldering.

Electrical solder has flux in it since you have a "Plumbers torch" maybe you are using plumbers solder. Never had a problem with solder connection like this I relocated a battery to the trunk of my Challenger almost 30 years ago with a connection like this and never had a problem with that connection. I changed these connectors on a few forklifts too this way and no problem.

zcookiemonstar wrote:

Kayteg1 wrote:
Ralph's picture reminds me one technical option.
If you want reliable high-amperage 12V quick connection, use electric forklift plugs.
They come with couple of sizes and can be rated for 400 amps.
Basically idiot-proof in usage and silver-plated prongs last long time.
Crimping the connectors might be hard as it require special and expensive press, but what I was doing for my winch was hammering the end of connector flat, drilling a hole and using short bolt connecting a cable with eye connector on the end.
Brass or SS bolt makes it lifetime set.

require special and expensive press?? I always used solder in the past. I would hold the connector end vertically in a vise have wire stripped and ready. Heat the end with a propane torch and fill the hole with solder then just stick the wire in.

I've been soldering connectors as well, but I do have plumbers torch, that cost money as well.
Also from your description you did not clean and flux the wires in the cable. That will make for cold solder.

Solder actually has pretty poor resistivity, and will add resistance and voltage drop to the connection. Hammer style crimpers can be inexpensive.

I built a rack, actually had someone else weld it. Installed it under the passenger side wing of the Lance. Used 4ga marine grade cable and Anderson connector. The battery is a group 31 AGM mounted on it's side. I took a battery box and cut it so it would protect the battery from flying rocks and such. I have use this set up for about 6 six years. It being an AGM, I don't have to worry about water or ruff handling. I check the battery connections about once a year to make sure they are tight. That's it.

Kayteg1 wrote:
Ralph's picture reminds me one technical option.
If you want reliable high-amperage 12V quick connection, use electric forklift plugs.
They come with couple of sizes and can be rated for 400 amps.
Basically idiot-proof in usage and silver-plated prongs last long time.
Crimping the connectors might be hard as it require special and expensive press, but what I was doing for my winch was hammering the end of connector flat, drilling a hole and using short bolt connecting a cable with eye connector on the end.
Brass or SS bolt makes it lifetime set.

require special and expensive press?? I always used solder in the past. I would hold the connector end vertically in a vise have wire stripped and ready. Heat the end with a propane torch and fill the hole with solder then just stick the wire in.

x2 for Ramblin' Ralph's idea, we have 2x100ah FIT batteries in the TC and one extra in the bed that uses the Anderson plugs with a double adaptor. While driving it connects the TC and extra battery to the second battery in the engine bay. This is all topped up by the 250amp alternator that we fitted. With all these DW and I get 5 days of camping without starting the generator.
The crossover switch in the engine bay means that we don't drain the cranking battery for starting.
All the cables are big and flexible, they take me ten minutes each to fit into the 50 amp connectors, then they get crimped and then they get soldered for good connection.
All these ideas come from this forum.....

Kayteg1 wrote:
Did you have your axles weighted?
From what I learn about TC is the last thing you want on them is put heavy stuff in the rear and have front axle lifting off the ground as the result.

Believe me that isn't an issue with an older unit like this on a Dually. 50# more on the back will make no difference. This camper grosses at least 800# less than the Lance 981 I carried for nine years on the same truck. Yeh the battery will change the axle ratio slightly but not enough to notice. If it does I can always balance it with a couple of cases of beer in the back seat of the truck. ;)

Did you have your axles weighted?
From what I learn about TC is the last thing you want on them is put heavy stuff in the rear and have front axle lifting off the ground as the result.