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Sure,if the posts are in the right location and the battery fits the hold down. 12volt batteries are 12 volt batteries. The cold cranking amps differ for different size batteries, but that won't have any effect if the battery fits. Go for it.
You can if you plan to convert all of your electrical system, starter, lights, gauges and accessories to 24 also. And change your battery to 2 batteries connected in series. Why would you want to??
Not if both batteries are of similar capacity and fully charged.
Connect them in Series and you will get 24 volts but the amperage will be the same as 1 battery.
NO. Absolutely not, you must hook them in parallel. Two 12 volt batteries hooked in series will give you 24 volts with the same A/H of one of the batteries. Hook them in parallel and you will still have 12 volts and double the A/H of one of the batteries.
Depends on the amperage of the batteries you are using. Both setups will give you 36 volts, but you will normally have a longer run time with six 6 volt batteries in series than three 12 volt batteries. That is why golf carts use 6 volt instead of 12 volt batteries.
both Neg to body(ground), Pos to Pos .. keeps 12 volts, higher amperage -=TWiG=-
As far as I know you can only do it if your lorry has two 12volt batteries connected in series, ie with the positive of one battery connected to the negative of the other. If so, then you connect the car jump leads to ONE of the lorry batteries in the normal way (car positive to lorry battery positive, car negative to lorry battery negative). Try to start the lorry like this, with the car engine running at a fast idle, with all electrics on the car turned off. If this doesnt work, try again with the jump leads connected to the other lorry battery ONLY. If this doesnt work, then both lorry batteries are too flat and you'll have to jump off a 24volt lorry / charge or replace the batteries. Jumping off a 12volt car usually only works if you have one lorry battery which is ok-ish, and you use the jump leads to "help" the weak one with the car. Good luck from Norn Irn!
2 batteries are wired in series then these 2 are wired in parallel with the other 2 which should also be wired in series. series is positive to negative and or negative to positive. parallel is pos. to pos. and neg. to neg.
If you are referring to a small 12 volt battery as used in a cordless drill, the answer is no. Those batteries do not have near enough amps to turn over a vehicle engine.
by definition the wattage is the criteria 12v x 2amps=24 watts If the circuit in question needs 2 amperes then an exactreplacement mandatory, however if the circuit in question only draws 1.5 amps then it is realistic possible
You can replace it with any 12volt flasher you want, provided that its rated load is the same as the wattage of the signal bulbs you are using.