Thread: Power to Rear Anderson Plug to charge trailer battery

Hi Franz and your idea is the simplest way to achieve what you are after.

Just make sure you take your positive connecting for the rear cable at the cable side of the circuit breaker at the rear battery, not the battery side, or you will need another circuit breaker.

This diagram should help you.

NOTE, this is an old diagram and all circuit breakers should be 50 amp

Gday, I personally would not tap into anything their I would run a new line ' I ran 12V Battery Isolator, 4 Post, 60 Amp | Caravan Switches & Relays | CaravansPlus (this is mounted L/H side under the bonnet against the side guard and have a manual switch on the dash I will be changing to a auto switch when iam reading to go camping again) a 30Amp Circuit Breaker Automatic Reset

Thanks Tim.

I think my circuit breaker is mounted between the main battery and the SC80.

I'm unsure as to how to splice into the cable and get a good clean connection though. Cutting, joining & soldering is all I can think of but my soldering skills are so bad I'd rather try for a better, cleaner connection solution.

Cheers,

Franz

Go from your second battery and put a 50A circuit breaker in-line as close to the positive terminal as you can. Keep using a minimum of a 13mm cable and it'll be fine.

There's no need to have a switching mechanism/controller as you've already got that fitted between the main & secondary battery.

There is thoughts in regards to dissimilar batteries being connected together without a controller, but I'll leave that discussion for someone else.

Hi Franz, do you really need to splice into the cable, what length of cable are you saving by doing this if your battery is in the back already?

If you do want to join the cables there may be a fitting available that could clamp around the bared cable, just remember to ensure it is well insulated afterwards.

Alternately, cut the cable, attach terminals at the cut and the new cable ends and fit in a junction box.

Good luck

Mike

Originally Posted by Franz

I think my circuit breaker is mounted between the main battery and the SC80.

Hi again Franz and you SHOULD have a second circuit breaker, for safety reasons, at the rear battery.

If you don’t, then you need to fit on and then use it as the junction for your new positive cable you want to run to the Anderson plug.

The negative for your new cable can come directly off the rear battery’s negative ( - ) terminal.

You can buy gold plated distribution blocks from Jaycar which have 2x4B&S in one end and 4X8B&S in the other.
All you do is cut and bare and the cables are held in securely by allen screws. I have been using these for years with no problem, and they have lots of spare taps for 8B&s to run more plugs etc as required.
Regards Philip A

Hi Philip and do you have a part number for the joiners?