Amps is a measurement for Current flow Think of it as a water hose the larger the hose the more flow same for wire size .14 AWG (American wire Gauge) is rated for 15 Amps, .10 AWG is rated for 30 amps.
In DC (Direct Current) batteries are rated by Voltage and CCA
(Cold Cranking Amps) The CCA of a battery is how much current the battery in good condition will have available to turn the starter motor.
(Note batteries used for emergency lighting systems not in automotive use are rated in AH amp hours ) not related to tractors.
Bart Master Electrician