Installed new DORMAN 600-100 Actuator (Thermal type) in 2021. Used 4-WD. once or twice since. New fuse blows as soon as key turned "on". Obviously the wiring and or harness or connector(s) or relay(?) etc. may be suspect. I've replaced 3 actuators since 2008 and I'll go a year w/o engaging 4-WD. Any suggestions? Thanks!