how to fix my rear actuator problem it doesnt seem to be getting power can u hel on 2001 Isuzu Trooper

i have check everything else i can reach and think of to my knowledge.i am not a mechanic but i know a lot about mechanics. and seems ok but i cannot get 4 wheel drive to engage on this 3.0 trooper.the transfer case motor actuator or its wire loom is the problem i think but still not sure cause cant see any further as little space to work there a wiring loom diagram for 3.0 trooper 2001 which shows me where the loom goes from transfer case all the way back to engine and battery ect. with parts labelled or can anyone help me?please

Asked by for the 2001 Isuzu Trooper
Tap on the actuator motor with a hammer,if it now switches replace the motor. If it does not switch scan test!