How to configure two batteries in JD450C

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bugman
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How to configure two batteries in JD450C

Post by bugman » Wed Dec 21, 2016 8:03 am

1978 JD450C, runs good, but is often a little hard to get her going (on cold mornings in particular).

The battery box under the left armrest will accommodate two batteries (and the manual mentions that it can)... how would I connect them?

I assume positive of #2 (new additional one) to positive of #1 (main battery), and negative of #2 to negative of #1? This configuration (a parallel connection, right?) will maintain same voltage (12v) and double the amperage, right?

Do both batteries need to be the exact same type/strength?

I have another new battery that is NOT identical to #1 in the machine, if I use non-identical ones will it harm anything? Damage the alternator, or burn up one (or both?) of the batteries?

The battery I have in there now is a NAPA commercial maintenance free for trucks/tractors, with 950 CCA, the 2nd one I already have is a basic (cheaper) auto battery with 650 CCA.

Thanks for any advice!!
bugman

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Stan Disbrow
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Post by Stan Disbrow » Wed Dec 21, 2016 10:28 am

Hi,

Parallel connection. Batts need not only to be the same, they need to be both new together. Otherwise, they will tend to drain each other.

Stan
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bugman
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Post by bugman » Fri Dec 23, 2016 9:42 am

Ah... makes sense - thanks!
bugman

ferroequinologist
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Post by ferroequinologist » Fri Jan 13, 2017 5:40 pm

I have two in my 450. I put them in with the positives facing each other, made a little jumper, and hooked them both together. Then I made a longer jumper, to connect the grounds together, then ran a new ground under the seat to a cleaned spot under a transmission bolt. Originally it was grounded to a bolt in the battery box, but I always seemed to have a week ground.

Starts much better with two batteries and the new ground.

bugman
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Post by bugman » Mon Jan 16, 2017 7:56 am

Thanks for the responses guys!
bugman

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MarkW
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Post by MarkW » Fri Feb 10, 2017 9:18 am

Also, if you are not sure of the condition of your cable put a test light on the battery terminal and the starter terminal and crank the engine. If your cable is going bad for whatever reason the test light will glow or light up. Often it can be just a bad terminal on either end but it is easy enough to do and can help with a lot of sluggish cranking issues.

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