Charge the new battery for 24 hours.
Check the one working fuse (other is just a spare).
Check your battery cables for clean, tight connection and for corrosion near the terminals up under the insulation.
Welcome to the forum.
'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
'16 RZR XP4 1000 Turbo