92 FJ80 Dual Battery install

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Jun 30, 2011
Jacksonville, FL
So I finally got around to installing my dual battery system, so here it is.

I pulled the cooling fan after running it disconnected for about 2 months, just to make sure there would be no issues without it. I will probably put in some hood vents at some point to help with under hood temps.

I got a battery box from arcterx in Texas. I had to trim some of the bracket off behind the new box and a little near the radiator, but not much work there.

I ran 2 AWG cable and soldered all the connections. I ran the sure power battery isolator and a blue sea fuse block between the main battery and the isolator.

I know there are different schools of thought on this, but I have all accessories on my main battery and have the second battery for backup starting duty only.

I got my second battery from interstate. They have blemished batteries for 45 bucks, so I got a group 27 cheap!

Overall I'm super happy and all is working as I hoped. Here are some pics....
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I want to do simple system like this too. How many amps is the battery isolator? Thanks, Darrell
Just a question, if the aux battery drops below 12.7 and you have bidirectional surepower separator the separator would open the solenoid and you would not be able to charge the aux battery. This is from surepower website:

The 1314A (unidirectional) and 1315A (bidirectional) are 100A battery separator modules with an integrated relay for 12V systems. The units monitor both the main and auxiliary battery banks. If the main battery (for the 1314A) or either battery bank (for the 1315A) is above the connect threshold, the relay connects the two banks together. If the main battery (for the 1314A) or either batteries (for the 1315A) are below the disconnect threshold the unit will open the relay. The connect threshold is set to a nominal voltage of 13.2V, which would only be reached when the charging system is operating.

I have the situation that I have 1315 and aux is below 12.7 and even with manual switch I can't connect those batteries together.


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