Diff lock light blinking but won’t engage

2002 grizzly 660. I’ve owned the beast for about a year and the 4×4/diff lock wasn’t working when I bought it. I’m just now getting around to fixing it and having some issues. I got the 4×4 to work by replacing the motor inside the servo. ( I am not electrically savvy whatsoever so sorry if I’m not using the correct lingo). It bench tested fine using the 2 c batteries. Installed the servo back on the diff and will now go into 2 or 4 wheel drive just fine. When I turn on the diff lock the light on the cluster blinks but never engages or makes any noise. Before reinstalling the servo, I made sure the rack gear that moves the fork slid freely side to side. Not sure where to go next, any help is appreciated.

Diff lock light blinking but won’t engage

2002 grizzly 660. I’ve owned the beast for about a year and the 4×4/diff lock wasn’t working when I bought it. I’m just now getting around to fixing it and having some issues. I got the 4×4 to work by replacing the motor inside the servo. ( I am not electrically savvy whatsoever so sorry if I’m not using the correct lingo). It bench tested fine using the 2 c batteries. Installed the servo back on the diff and will now go into 2 or 4 wheel drive just fine. When I turn on the diff lock the light on the cluster blinks but never engages or makes any noise. Before reinstalling the servo, I made sure the rack gear that moves the fork slid freely side to side. Not sure where to go next, any help is appreciated.