2002-2007 Suzuki 500 LTA Service Manual, Page 324Get this manual
ELECTRICAL SYSTEM
First check the insulation between and and between and terminals with the testerApply 12 to the terminals as shown in Fig-1, and check the continuity between and Apply 12 to the terminals as shown in Fig-2, and check the continuity between and If there is no continuity, replace the 2WD4WD selecting relay with new one