Second battery cannot start boat

[twcanuck]

Greetings all!

I have a 04 Sportster 155 and I installed a dual battery set with the help of posts on the awesome forum. I have identical group 24 deep cycle/stater batteries but when I move the switch from 1 to 2 and try to start the boat all I get is a click-a click-a click-a sound (no beep errors when I connect the DESS). Switch back to battery 1 and the boat fires up immediately. I have tried moving battery 2 to tray 1 and the boat fires right up again so I know battery 2 can start the boat. Could someone please point me towards the next step for trouble shooting this? Thank you in advance for your time.

 

[Coastiejoe]

Check the cables and connections... If they are poor, you will not get the volts/amps you need and it will go CLICK..

 

[JPass]

Definitely sounds like the cables.

 

[twcanuck]

Thanks for the replies! Ill check them this weekend.