1997 chev tahoe blowing transfer case fuse

[69chev]

Gonna starts snowing soon HELP

Hey there new to the forum. So when starting vehicle 4 wheel drive switch lights up for a quick second. I have tried to remove fuse and wait ten minutes. i then replaced fuse. Then turn ignition off and on 5 times per some other postings. It still blows transfer case fuse. Any help is much appreciated. Thanks in advance

[777stickman]

Welcome to AF.

List the selections on your t-case switch.

Also describe exactly when the fuse blows.

[69chev]

Originally Posted by 777stickman

Welcome to AF.

List the selections on your t-case switch.

Also describe exactly when the fuse blows.

Assuming you mean selections on dash for 4 wheel drive...? They are 2 hi 4 hi and 4 lo. After replacing fuse it blows as soon as I try to engage 4 wheel drive to 4hi. Thx for replying 777.

[777stickman]

With that info I would suspect an internal short in the encoder-motor at the t-case.

You could remove the electrical connectors (2) at the encoder-motor and try it, but I'm not sure if the selector switch lights will work?? Might be worth a try. If the lights still work and the fuse doesn't blow then lean towards the encoder-motor being faulty. The motors are prone to internal electrical failures.

Other items in the system that could cause the fuse to blow are the selector switch, t-case control module and wiring.

Really need to get it properly diagnosed before throwing parts at it.

[j cAT]

Originally Posted by 69chev

Assuming you mean selections on dash for 4 wheel drive...? They are 2 hi 4 hi and 4 lo. After replacing fuse it blows as soon as I try to engage 4 wheel drive to 4hi. Thx for replying 777.

it could be the encoder transfercase motor . also the wires going to this motor could be damaged...these wires have been known to get chaffed and shorted out to engine /frame metals..follow these wires back...with battery removed you could also check for a short to ground..