1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 403Get this manual
ELECTRICAL Electric Demand Drive Electrical Testing (19891991, Except Model, 1993 to Present Sportsman and 350L 6x6) The 1989 and new 4x4 front hubs are electro-mechanicalIf the system fails to perform as expected, it will first be necessary to determine whether the problem is electrical or mechanical and proceed to the appropriate sectionTo determine this, shift the machine to forward gear, turn on the ignition and 4x4 switches and check for the 4x4 light on the light panelIf the light comes on, skip to the mechanical troubleshooting sectionIf the light fails to come on proceed with the following testsRemove the fuel tank cover and expose the circuit boardWith the multitester set on DCV, place the Red test lead on the board Red terminal and the Black lead on the board Brown terminalReading should be Battery VoltageNo
Check circuit breaker, battery and battery ground
Turn ignition switch on and check between board RedWhite and board BrownReading should be Battery Voltage