All new parts, ATC 20A keeps blowing?

Tiny
KINGQUEENER740
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 289,600 MILES
I have replaced all of the 4wd components except for the TC itself. Brand new Cardone TC encoder motor hums but doesn't turn. ATC20A under hood keeps blowing then I lose all lights on 4wd push buttons. I have spent countless hours trying to figure it out. I have a feeling it is electrical. Where should I look for broken wires? I've checked everything around the TCCM, front diff actuator, TC encoder motor.
Friday, January 3rd, 2025 AT 10:00 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 49,970 POSTS
That fuse powers the control module and the encoder, I would unplug both and then replace the fuse, to see if it blows, that way you can tell if it is the wiring or not, if nothing happens plug the encoder in and then control module to see when the fuse blows, here is the wiring diagrams for the system so you can see how it works. Check out the images (below). Let us know what you find.
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Saturday, January 4th, 2025 AT 11:39 AM

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