Originally Posted by michael cole

if your primary concern is prolonging the transfer case try this.with the engine running turn the switch to test.then after a few moments back to run.this will generate a fault code in the 4 matic computer effectively shutting down the 4 matic operation.you can confirm this with the 4matic light in the instrument console being lit.when you wish to resume 4 matic operation simply disconnect the battery for a few minutes.this will reset the 4 matic computer