Testing transmission relay for CDL?

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Joined
Mar 24, 2012
Threads
6
Messages
18
Location
Darlington, SC
What's the easiest way to test the relay in floorboard kick panel to make sure its able to activate the center diff? I don't hear the click when pulling in 4L nor is the CDL/abs light coming on. It's a 93 fzj. Also, will unplugging the ecu beside it cause any issues?
 
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