For anyone who has set up a power supply to a trailer, Anderson Plugs are the plug of choice for connecting the vehicle trailer power supply wiring with the trailer power supply wiring. These plugs come in a huge range of sizes, and even colours now, with each of the different size plugs having a different amp rating, with each of the different colours only able to plug into a plug of the same colour.
The plugs can only be pushed together in a certain way, so there is no chance of connecting them up incorrectly (providing the wiring and lugs are installed correctly in the set up stage), and each plug is marked with a "+" and "-" on either lug/terminal as an added reminder.
The most popular Anderson Plug size is the 50 amp plug with #6 contacts, as this is ample big enough to handle the power to charge an auxiliary battery in a trailer. These plugs are available at most auto retail outlets as well as E-bay, and come in many different brands, and at prices ranging from $3.00 each to $18.00 each. I try and purchase genuine branded Anderson Plugs, and use E-bay retailers for this, purchasing packs of 10 complete plugs for around $30.00. To buy genuine or not is a personal choice, and I'm not convinced there is much difference between the genuine and non genuine products, but it is just my choice.
50 amp Anderson Plug Dimension
Anderson Plug Accessories
Dust covers with rubber or hinged lids.
Rubber boots for the back of the plugs.
T-handles to make pulling the plugs apart much easier.
Setting up your Anderson Plugs
Trim the insulation of the end of the wires you are using, so that there is just enough bare wire to insert into the lug.
Now this is the part which may divide a few people, I always like to crimp and solder my lugs, sort of hedging my bets I guess, but I figure it can't hurt.
To assist to hold everything whilst soldering I hold the lug with a set of multigrips.
I then hold the soldering iron on the side of the lug and allow the heat to soak through. At the same time I hold the end of the soldering wire in the end of the lug. As the lug and wire heats up, the solder will slowly melt and you will have to feed the wire into the lug. I keep feeding the wire into the lug until it fills to the top with molten solder.
Allow the lugs to cool.
The lugs can then be pushed into the plug housing, making sure you get the polarity right with the marks on the plug.
Inside the outer casing of the plug is a metal plate which locates and retains the lugs once pushed in correctly.
If installed correctly the contact inside the plug should look like this.
DISCLAIMER: I have no electrical qualifications, so take this advice as that from a backyard hack.