Why doesn't our Melex golf cart start after replacing batteries.

the cart is wired for 36 volts operation so you would need a 36 volt bulb
or
you could put the wiring for a 12 volt bub across the terminals of 2 batteries so the negative wire will be on a negative terminal of the first battery and a fused positive wire will be on the positive of the second battery
the batteries are connected in series so the sum total of the voltage is the sum of all of the batteries
by selecting 2 batteries in series you are using the sum voltage of 2 batteries

You load tested each battery? Can't be bad if cart runs good.

make sure that they are in fact 8 volt batteries
You can replace them with 6 by 12 volt batteries as the end voltage (48 volts ) is the same

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have the batteries individually load tested as I suspect that there are dead cells in one or more.

I have a melex mod ha18cm and batteries are charge and its getting spark but not starting what should i do ?Also all the wires are connected .

You said you have 6 batteries. Are they 6 volt or 8 volt? Hint-- 6 volt has three holes in the top and an 8 volt has 4 holes on top of the battery. Battery manufacturers recommend the use of a voltage reducer wired to the whole bank. This take the 36 or 48 volts down to 12 volts and is regulated. this is recommended so as not to stress just 2 batteries. If you have 6 volt batteries, you can use any 2 that are wired in series.