I completed my dual battery setup. What may be different than others is that I did the relocation of the main battery and was able to use a much larger group 31 battery for the secondary. The biggest challenge was the relocation of the main due to the short factory cables to the main power box and from the alternator. Here is some info should others want to explore this option.
The overall idea was to have the largest possible reserve in the original main battery area, and to used the location on the other side for the starting with the largest cold cranking amps and reserve as it will still be used for all the demands of a normal Land Cruiser and winching (although my controller allows the connecting of both during high loads or for jumping to the main). I was able to use a Group 31 dual purpose battery (such as the Diehard or Oddesey) in the original location with minor modifications to the bracket and the same type of smaller size battery- the group 34 with a customize 200 series group 34 battery tray and bracket (such as what @slee offroad is making). I went with the National Luna Controller.
Now back to the relocation decision. I search and found a way to tie the two wires(one to main power box and the larger wire from the alternator) together with the extension heavy gauge wire to the other side of the engine bay. You have to cut the battery terminals off of these short cables. The two go into one side of the inline connector and the 1/0 wire goes to the new starter battery. It is actually made for high current, high or low temperature DC water proof connector. It was designed to be underground for high current DC wires. It is called NSI Industries ESGS-4/0 Easy splice inline gel kit with connector. I found it on Amazon.
Anyway, here are a few pics that may help.
The overall idea was to have the largest possible reserve in the original main battery area, and to used the location on the other side for the starting with the largest cold cranking amps and reserve as it will still be used for all the demands of a normal Land Cruiser and winching (although my controller allows the connecting of both during high loads or for jumping to the main). I was able to use a Group 31 dual purpose battery (such as the Diehard or Oddesey) in the original location with minor modifications to the bracket and the same type of smaller size battery- the group 34 with a customize 200 series group 34 battery tray and bracket (such as what @slee offroad is making). I went with the National Luna Controller.
Now back to the relocation decision. I search and found a way to tie the two wires(one to main power box and the larger wire from the alternator) together with the extension heavy gauge wire to the other side of the engine bay. You have to cut the battery terminals off of these short cables. The two go into one side of the inline connector and the 1/0 wire goes to the new starter battery. It is actually made for high current, high or low temperature DC water proof connector. It was designed to be underground for high current DC wires. It is called NSI Industries ESGS-4/0 Easy splice inline gel kit with connector. I found it on Amazon.
Anyway, here are a few pics that may help.
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