Diff lock light coming on randomly and staying on?
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The diff lock solenoid is located on the passenger side firewall. The Blue wire with a White trace should have power when the diff lock switch is on. The Pink wire with a Black trace should have power when the diff lock switch is off.
It could also be a problem with the diff lock engaged switch in the diff. This switch switches an earth when the locker is engaged. You will need to check the operation of this switch and make sure the Green wire with a Red trace that connects to it isn’t shorted to ground.
You could also have a vacuum leak in one of the hoses that run between the solenoid and rear diff. Check both of these.
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