There's no officially sanctioned way to disable the seatbelt alarm in a 2008 Jeep Wrangler (or most modern cars for safety reasons). Attempting to do so by disconnecting wires or tampering with the system could void your warranty, affect other electrical components, or even be illegal in some jurisdictions. The alarm is there for a reason – to remind you to buckle up.
While some aftermarket solutions might claim to disable the alarm, they often involve potentially risky modifications and should be approached with caution. Consider the safety implications before pursuing such options.
The best and safest approach is simply to buckle your seatbelt.