drivesafe wrote:Hi rocknferoza, persist with the Anderson plugs because they are specifically designed to not only handle the currents needed to run a dual battery set-up but are designed to be plugged and unplugged many, many times and always make a good connection.
As to the terminal not going in properly, did you have the terminal the correct way up. This can not only cause problems when pushing the terminal into the plastic housing but, as the terminal can be fitted upside down, if it is, it will stop the plugs being pushed together.
If you need to remove a terminal from an Anderson plug get a small screw drive and hold down the spring locking plate, just inside the connector end of the plug and then pull the terminal out the other end.
Cheers.
Yeah! Wot he sed!
Anderson plugs are made for this application - trailer plugs are not.
I haven't wired many Anderson plugs, but I know I farked the first one!

As drivesafe said, it's not hard to insert the terminals the wrong way. And it's not much harder to remove them and insert them properly.
Do it properly! You're so close! If your mate wants to give up, let him. If you can't do it yourself, pay a professional - there can't be that much left to do?