Four wheel drive high will not work

Tiny
IAN BRILEY
  • MEMBER
  • 1993 GMC SIERRA
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 400,000 MILES
Hi, I have a 4L60e automatic transmission and manual four wheel drive on floorboard on truck. I recently got stuck in mud with no wheel drive and so I came home and did research and found my actuator was bad. So I changed it and a seal on my differential and before that actuator went bad I had both wheel high and wheel low. Now all I have is wheel low, I use wheel drive a lot. My fuses are all good and so are my wires. I recently had the entire transmission wiring harness redone and they did not mess up. Can anyone please help me figure out what is wrong?
Tuesday, August 29th, 2017 AT 10:42 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,790 POSTS
It sounds like you have a short in one of the wires or there is a power or ground that needs to be check, do not worry it will only take about an hour. Here is the wiring diagrams to help you get started (below) and a guide:

https://www.2carpros.com/articles/how-to-check-wiring

Please run this test and get back to us so we can keep helping you.

Cheers, Ken
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Wednesday, August 30th, 2017 AT 5:01 PM

Please login or register to post a reply.

Related Transfer Case High Content

VIEW MORE