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Battery condition is extremely important. No voltage regulator can work correctly with a bad or weak battery. Always fully charge your battery before performing any charging system tests or replacing parts. If there is any doubt, have the battery load tested or replaced.There are two possible regulators for the Scrambler 400 1999 model. This regulator fits the A99BG38CA (LR39-1) version. For the A99BG38CB version, the right regulator is part RM30014. Always check in the 'Fits models' section and please compare to your original part before buying.Polaris Trail Blazer 250 -- 1996-1998Polaris Trail Boss 250 -- 1989-1998Polaris Sportsman 400 -- 1993Polaris Xplorer 300 -- 1996-1999Polaris Scrambler 400 2x4 -- 1998-1999Polaris Scrambler 400 4x4 -- 1995-1999Polaris Xpress 300 -- 1996-1999Polaris Trail Boss 350 L -- 1990-1992Polaris 300 -- 1994-1995Polaris Sport 400 -- 1994-1998Polaris 250 2x4 -- 1993Polaris 250 4x4 -- 1993Polaris 250 6x6 -- 1993Polaris 350 L 2x4 -- 1993Polaris 350 L 4x4 -- 1993Polaris Big Boss 250 4x6 -- 1989-1992Polaris Big Boss 250 6x6 -- 1992Polaris Trail Boss 300 2x4 -- 1995Polaris Trail Boss 300 4x4 -- 1995