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How to piggyback two 12 volt automotive batteries for extra cranking amps, but keep them 12 volt.

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The batteries should be wired in parallel to one another. That is Positive to Positive, and Negative to Negative.

Posted on Dec 31, 2010

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Positive to positive and neg to neg ,easy

Posted on Dec 31, 2010

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My battery have correct gravity of each cell and voltage also correct but its hard to crank the engine

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you can have 12 volts . but no cranking amps

Jul 17, 2016 | Cars & Trucks


12 volt battery test

I have seen many times a 12 volt car battery pass the diagnostic test performed at a repair shop but still fail while being used in the car.
A simple test to do at home is the cranking amps test. Place your 12 volt meter on the battery and check for 12 volts. Then looking at the meter crank the car over. If the voltage drops to 10 volts with all accessories off then the batteries cranking storage amps is weak. A bad scenerio would be the battery drops to below 9 volts. Below 9.6 volts there is not enough electricty to provide good spark to fire the engine.

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What would be the approximate ampre hours of and weight of an average five hundred cold cranks 12 volt car battery.

A lot depends on make and construction, but here is a good place to start.

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How to wire rhe batterys for 24 volts... Example pos. To pos. Or neg. To pos. Ther are two batterys 12 volts

if you want the same voltage but with increased capacity connect positive to positive and negative to negative on each successive battery ---connected in parallel
example 6 X 12 batteries each of 200 crank hours will be equal to 12 volts and 1200 crank hours ( good for mobile fridges , winches , battery hoists etc)
if you want to increase voltage in the bank then connect positive to negative for each successive battery ---connected in series
for example
with 6 X 12 batteries of 200 crank amps you will have 6 times the 12 volts which equals 72 volts and the current flow is increase from 200 crank amps to exceed the 1200 crank amps because of the electrical principles and formula I think it works out to be around 72 times the 200 crank amps ( I am sure that there are mathematicians out there that will adjust the sum to make it correct)
However I think that you get the idea
when charging batteries it is always positive to positive with the battery leads to the first battery in the bank and the difference is if in parallel the charger has to be big enough the charge at the accepted rate of the batteries ( 12 volts charge at 14.5 volts and around 20 amps an drop back as the batteries charge
when the batteries are in series it all changes and best talk with a good battery supplier as to how it is set up and if you need to change the charging circuit and equipment

Jul 19, 2015 | Cars & Trucks

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Can i use powersupply 12 volt instead of battery to test the ups

I don't understand, what is "ups"? I haven't had my morning coffee yet.

I have run an automotive radio off a battery charger, in the past. As long as everything is for 12 volt system. I don't know if the amp output would be enough to run that system, whatever it is?

Jun 04, 2015 | Cars & Trucks

1 Answer

2001 ford explorer sport wont charge

I'm not sure if you have all of the info you need to go forward with this.
The battery may be rated for 800 amps but could have less than 12 volts if the alternator is not charging it.
It could have a dead cell which would keep it from holding a charge.
You would need to check the charge of the battery with a volt meter, then see if the alternator is charging at 14 volts when the engine is running. The battery should be at least 12 volts with the engine off.
The problem could be in the wiring from the key switch or dash gauges back to the alternator.

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I have an 800 amp battery for my 1995 land cruiser. how many cold cranking amps should my battery have?

Hi: The Specs on a Battery Range From 600 Cold Cranking Amps to 750 Cold Cranking Amps. So if you have a 800 Cold Cranking Amp Battery installed then you are at or Above The Required Amperage Needed.Unless your Running Extra Lighting or Accessories. and you have to consider your Alternator Out-put as well.You need a Alternator that will Keep up the Charge on Your Battery. So in a Nut Shell the More Add Ons you Have the More and The Harder your Alternator has to Work to Try and Keep Your Battery at a Full Charge . A Fully Charged Battery you'll have 2.1 Volts per Cell = 12.6 . Hope this has helped you, Please Let me know how I've Solved your Problem with my Solution. Thanks and Good Luck From d_hubbs

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My battery says it has 12 volts, but i don't get anything when i hit the key

Measure the voltage while cranking. If the the voltage doesn't change much, then you have a poor connection, maybe due to corrotion or loose connection which is not always obvious. If the voltage drops signicantly as you are cranking, then you have a weak battery. To crank the car you need more than voltage. The twelve volts has to have enough CURRENT as well. Currents unit is expressed in AMPERE, or AMPS for short. VOLTAGE and AMPERE always go together to give you electrical power. If you want to know how much electrical power you have you just multiply Voltage by Current., and you get WATTAGE. Usually in automotive wattage is not used much since the voltage is always around 12 volts and therefor power is determined by just AMPERE. I HOPE THIS WILL SHED MORE LIGHT TO UNDERSTANDING WHY YOUR CAR WONT CRANK EVEN IF THERE WAS 12 VOLTS.

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Trying to install narva driving lamps unit has

In 12 volt DC automotive electrical systems black is always the ground wire or negative. Make sure you disconnect the battery before doing any electrical work (unhook the negative cable first). Don't splice into any wires under the dash, use a piggyback fuse connector on one of the accessory fuses eg; cigarette lighter.

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