Grounding issue

Bike is a 02 scrambler 500 just got it and haven’t picked up a manual yet the 4×4 isnt right. Armature plates are bent and tabs wore off. However i have a question about the wiring when i disconect the 2 plugs (one for each side) and use a test light grounded to frame i an getting very weak voltage on both wires on both plugs and a higher voltage when i flip the awd switch to on. I watched a video and it said the brown wire sould be a ground. With the hubs apart the doesnt apear to be any magnetic force to old the armature plate. Am i on the right track