2012 Kenworth T660 4 batteries, 1 pair not charging

Show me what your looking at here?

Most commonly larger cables in plastic boxes are connected to a Mega fuse in 100 or 150 amp which is most commonly cab supply power or other main circuits. Could be other things as well such as APU or Smart Air charging controllers. Another bank of batteries somewhere for aux power?

 

I had same problem few year back specially in winter months , so I made jumper and connected all 4 in series for 12 volt , never had the problem , Kenworth setup few different types of battery pairs , in winter 2 batteries are not enough to crank , I had weirdest setup , even once I called different town trucks for jump start no one could , later year found why bcoz we were connecting positive to no1 battery and negative to no. 3 lol , learned a lesson and later added 2 more batteries total of 6 , 2 for house load (espar, inverter, tv , fan sub woofer) and 4 for starting even can use 6 for starting 4 1000CCA, 2 cat 850CCA for house load with relay keyed to switch and manual switch. Never needed boost again.

 

Wow some of you folks need to brush up on your electrical. Read post #7. There is no such thing as "2 batteries for the starter and 2 for house loads." The 4 batteries are simply connected into groups of 2 and those 2 groups of 2 batteries are connected at the starter. All 4 batteries are always available for ALL electrical needs.

 

The smartest thing alot of these guys could do is add a bank of deep cycles for house loads, ect. Even with no gen set the battery power would run plenty over a ten hour rest break. With a simple isolation relay powered by ignition your cranking batteries would never get depleted. Once your driving again, your house batts would be recharged for the next stop.

 

You are right

 

There's probably a million configurations.

The end result though. Is 1 group.