Why don't I get power to the motor on my Golf cart and how can I fix it.

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

If you are getting full voltage to the motor and that is the best you can do, then you have no recourse other than to change the motor.

Troubleshooting a golf cart - APLawrence.com

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Put Spring In Your Electric Golf Cart ' Golf Cart Talk Blog

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Basic EZGO Golf Cart Problems And How To Fix

sounds like you have either a relay or computer that is bad, needs to be serviced

Pleasecontact golf cart Kings out of Austin Texas. They will be more than glad to help you with this problem that you are encountering. Their Tek savvy is always free. Please be patient as so many people are always asking questions. But you can't beat free. A thumbs up would be greatly appreciated if answer is helpful for your question. THANK you and GOD BLESS

The solenoid should click when cart is switched on.When it clicks on it sends the full voltage to the motor controller and motor.Check the voltage going to the solenoid with a volt meter on the thin wires.

Verify series battery wiring. The main positive wire which goes to the solenoid should be on a positive battery post, that will be your main positive. Then from there we go series to all the rest of the batteries until we are left with a negative battery post, that will be your main negative. Make sure your charger wires are connected to the mains.

If it was me, if it gets hot, that's usually a sign that the juice if flowing through it wrong. Sounds like you've got something hooked up backwards. or grounded out to something else. Check everything again. Get help from a professional if that doesn't fix it.

The batteries are connected in series (6V + 6V+ 6V +6V +6V +6V), Select only two batteries (CONNECTED TO EACH OTHER in series FROM POSITIVE TO NEGATIVE (last two batteries preferred) and run two wires (one black one red) from the positive (red) and the negative (black). purchase two switches one MOMENTARY PUSH BUTTON AND ONE TOGGLE. Split the two wires by ADDING another length to the middle of each wire respectively Add the switching devices by connecting the red wire to one of the terminals. The other terminal will then receive Another length (red) to be the connected the same way to the horn (push button switch) The black wires (ground) are to be connected to the other terminal of the horn and light. NOTE: it is advisable to add a 15A in line fuse to the red wire near the battery.

The exact answer depends on what battery voltage you have but this hint will get you going.
Assuming you have 3 12v batteries, just wire to the first battery + - and you'll have 12 v. If you have 6 6v batteries, wire to the first + and the second -. If you have a voltage meter, you can verify the voltage of my suggestion.
This will work for lights and other resistance circuits but not for sensitive items like radios.
Golf cart batteries are series wired to get the higher voltage.
If this answers your question, I'd appreciate 4 thumbs. I do this for fun and do not get paid.