So I got the dreaded 4x4 blink and no 4wd engagement .Swapped transfercase actuator ,no help . Checked the power going to the front diff actuator with a meter and I got no power going to the actuator . All fuses look good. Anybody know where I should go next ? 4x4 Ecu? Can the 4x4 ecu be tested with a meter ?Are there any sensors/switches I should check ?