View Full Version : Dual Battery Install Help

07-01-2007, 12:51 PM
Can someone give me the quick and dirty on adding a second battery? I'd like to add one to my 07 Mobius.

I know I need;

1. Perko switch
2. Battery box
3. Battery - suggestions on type?
4. Cables - how many, length?

Maybe a simple wiring diagram?

Thanks in advance for your help.

07-01-2007, 11:29 PM
Check out the link. I would think the Perko switch would have instructions. I'm seeing that some people that have the Perko switch already installed are having problems understanding what positions do what and when to change switch positions. By using the supplied instructions along with drawing out the circuit for your boat, you will have an excellent understanding of the switch.


07-05-2007, 03:44 PM
http://inlinethumb32.webshots.com/6367/2615737670101539954S200x200Q85.jpg (http://good-times.webshots.com/photo/2615737670101539954RpFmGh)

I bought this Voltage Sensitive Relay & switch set: http://www.videoacustic.com/productos_ficha.php?familia=baterias&codigo=714-100A

07-16-2007, 05:15 AM
Well..Im still not sure about the ******* dual battery wiring...Im a bit dull about electrical issues and need some help from the experts.
This is the electrical wiring diagram I have planned, main wiring diagram was provided by SC,but reading the instructions manual of the single battery switch that came with the boat, it says it includes an alternator field disconnect feature, and Id like to hold this useful thing even adding the dual battery switch with voltage sensitive relay I bought.Do anyone know if this is right, please, see the wiring diagram.
http://thumb14.webshots.net/t/58/458/2/62/93/2225262930101539954GJERPM_th.jpg (http://good-times.webshots.com/photo/2225262930101539954GJERPM)
I see two positive wires attached to the battery positive pole at the single battery installation, one ticker (like myself :lol: ) coming from the switches and then from the engine, and one more slim that I suppose goes to the buss bar.Question is that if I connect that positive slim wire to the house battery,like SC diagram says, the ignition key on the dash will work with that second(house) battery, if I understand well, and not with the sensed battery 1 that I want to be the engine cranking one.
So, would I need to run a second wire directly from the ignition key to the main(sensed) battery for using this as the cranking battery and keep other wire for the bus barr for all the accesories with the battery 2.
I know it is a bit of a mess,if anyone speak spanish I think it would be easier for me to explain,sorry.. :lol:

07-16-2007, 01:34 PM
As for cables ....

Check your local automotive store. They usually have large gauge (2, 1/0) cables at different lengths with the terminal rings already soldered on. I picked up a few of these to wire the 2nd battery to the perko switch.

As for battery ....

I've always been a fan of Optimas. I run a yellow-top, I think current retail is about $190.

07-16-2007, 04:10 PM
Did the existing positive cable going back to the engine compartment have a regular automotive type (pinch) terminal on it?

12-26-2007, 03:43 PM
Well..tomorrow is the day when Im going to set the second battery and I got one last doubt :oops:
Im going to hook the engines cranking wire to the main #1 battery and all the rest coming from the buss bar to the second one, as SC recommends.
Question is: Will the ammeter on the dash monitorize the main battery if all coming from the buss bar is hooked to the second battery and, at the same time ,isolated by a voltage sensitive relay? :shock: :?: :oops:
Hope any "electroguru" in this forum can advice me and understand what I mean with all this ,which I am not sure if I explained myself enough well in this crap english I feel I am trying to destroy... :oops: