diff lock light on (in unlock)

lithium1330

Technical Excellence Contributor
Callsign: KM6FDG
This is a '97 NAS - just replaced LT230 with a rebuild unit from another owner.
After putting the 230 in, the diff lock light is stuck on when truck is sitting idle (auto transmission in drive & TC is open-not locked).
When there is drive momentum (giving it gas) the light goes out, but if I let foot off gas/coast, the diff lock light comes back on.
In some instances, road bumps will flicker the light.
I am not sure if the switch (height) needs to be adjusted or if it maybe a wiring/grounding issue.

Anyone experience similar before and how to diagnose/troubleshoot? Thanks!
 

4RF RDS

Well-known member
Yes likely the switch needs to be backed out about a halt turn or so. It can be done by feel lying under the truck, a bit fiddly but doable in ten minutes.

Good luck.
 
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