single or dual battery

[mutlu]

Hello from Istanbul,

Our swapping 350 to 6,2(4L60E to 700R4)project is still continue.My car is a 95 Tahoe.We were starting to put second battery table yesterday but my mechanic freind suggested me that staying in the single battery with high amp/battery.

What is the reason of dual battery in diesel engines?
Thanks

[G. Gearloose]

You need a new mechanic friend ;)

[4x4Dreamer]

as far as I know, it's for extra umph for the started to crank over the 21:1 compression. After that, older mechanical Diesels draw very little power. I drove home with no alternator belt, 20 miles, in the dark with the radio on and the only thing I noticed was a nice bump in power.

[Craig M]

In most weather conditions a single battery will work fine. The colder areas require more cranking and the batteries are less efficient. If you can get one batterry with the amp capacity of the 2 OEM batteries you will be equal to original.

[moondoggie]

Good Day!

[mutlu]

Thanks Gentleman,I have received my answer.Is there a any connection or regulator between two batteries for equal charging two batteries?

Ozkan

[DmaxMaverick]

The batteries are wired parallel with no isolator.

Connection for a "normal" 2 battery 12V system is:

+batt(1) to +batt(2), +batt(2) to starter.

-batt(1) and (2) have independent grounds. These are very important. The best method of grounding is to ground both batteries to the engine block, then ground the engine to body and frame independently. The larger the cable, connectors and poles, the better current. Make sure all connections are bare metal, large, and greased for corrosion/weather protection.

The best remedy for battery connection failure was posted by Dr. Lee at: (Dr. Lee's terminals) (http://www.thedieselpage.com/members/batterm.htm) if you have side terminals. If you have top post batteries, be sure to use OEM type cables or quality crimped terminals. Do not use the terminals that "bolt" the cable to the teriminal, also known as emergency replacement terminals.

IF you have a 24V system, all rules apply, but the connections are SERIES, not parallel: G to -bat(1), +bat(1) to -bat(2), +bat(2) to starter.

You could also use 2 high capacity commercial 6V batteries for a 12V system if they are wired like a 24V system. I know of one person that did this with a 6.5TD and it worked very well, perhaps better than a 2X12V system. The batteries cost quite a bit more than 12V's, but, theoretically, should last twice as long or better. This was 7 or 8 years ago, and as of 2 years ago, it was still going strong. He used Delco commercial 6V's, like would be found on a OTR (big rig) tractor.

[NH2112]

I've run a single battery for the past 2 years with absolutely no problem. In this area temps falling well below 0F at night are very common in the winter, but 2 hours of on time for the block heater gives me pretty easy starts even at -30F. That being said, 2 batteries are better - when they're connected in parallel the voltage stays the same and the amperage is added. 2 800CCA batteries in parallel gives you 1600CCA, which will start just about anything in any temp.