4 wheel drive will not engage on my 1989 gmc sierra 2500?

4 wheel drive does not work - CarGurus

www.cargurus.com > Questions > Chevrolet > Suburban

CarGurusDec 17, 2009 - 4 wheel drive does not work - When I put the Sub in 4 wheel drive, low of high ... I want to "add" 4 wheel drive to my 95 1500 suburban w/ a 350.

My 4 wheel drive stopped working - CarGurus

www.cargurus.com > Questions > GMC > Sierra 2500

CarGurusJul 15, 2014 - My 4 wheel drive stopped working - After struggling with the 4 wheel drive ... sometimes in low sometimes in high, now it doesn't engage at all.

4WD not engaging all the time. - CarGurus

Often lights under a dash or indicators just blow out bulbs. If more than one thing isn't lighting and are centralized check fuses to see if its blown. Bulb or fuse. IMHO. MIGHT be a sensor on tranny too. Hope not.

Here's a video with detaile dinstrauctions and other people's fuse questions. New fuses?

Kind Regards,
Scott

Interior Fuse Box Location 1999 2007 GMC Sierra 2500 HD 2004 GMC Sierra...

Amazon com Fuses Fuses Accessories Automotive

2004 GMC Sierra fuse box Questions

Kind Regards,

Scott

I would think so..

4wheel drive wont engage on 1990 GMC sierra 2500 what could the problem be ,if it is acutator where is it located

A.T., VIN model "C" (4x2), TH400, 6 cyl
A.T., VIN model "C" (4x2), TH400, 8 cyl, 8-305 (5.0L)
}A}}400}466495" type="radio" name="userInterchange" />A.T., VIN model "C" (4x2), TH400, 8 cyl, 8-350 (5.7L)
}A}}400}466496" type="radio" name="userInterchange" />A.T., VIN model "C" (4x2), TH400, 8 cyl, 8-379 (6.2L, diesel)
E>}B}}400}466497" type="radio" name="userInterchange" />A.T., VIN model "C" (4x2), TH700, diesel
A.T., VIN model "K" (4x4), TH400, 6 cyl
B@}}}400}466499" type="radio" name="userInterchange" />A.T., VIN model "K" (4x4), TH400, 8 cyl, diesel
A.T., VIN model "K" (4x4), TH400, 8 cyl, gasoline
A.T., VIN model "K" (4x4), TH700, diesel
FFC}B}}400}466502" type="radio" name="userInterchange" />M.T., 4 spd, 4x2, VIN model "C"
FFC}A}}400}466503" type="radio" name="userInterchange" />M.T., 4 spd, 4x2, VIN model "R"
ECB}B}}400}466504" type="radio" name="userInterchange" />M.T., 4 spd, 4x4, (VIN model "K")
M.T., 5 spd, 4x2
M.T., 5 spd, 4x4
A.T., VIN model "C" (4x2), TH700, gasoline
F=A}B}}400}466508" type="radio" name="userInterchange" />A.T., VIN model "K" (4x4), TH700, gasoline
}B}}400}466509" type="radio" name="userInterchange" />A.T., VIN model "R" (4x2)

on the transfer case under the truck, there is a relay. both of my trucks have done the same thing and it was that simple problem. the wiring is on the drivers side of the case.

Then the problem would be in the differential. something came loose or broke off the actuator on the inside

Use this guide to help you find the color
https://www.duplicolor.com/color_selection.pdf

need engine size 5.0/5.7.6.4 with or without deistributor without dist it is automatic with could be anywhere between 3-12*BTDC (before Top dead center)

try going into reverse for 10 feet then go to drive for 10 feet that might help if not it is to the wiring to you 4x4 engage system (wires to your wheel hub)

I’m happy to assist further over the phone at https://www.6ya.com/expert/john_2c7bb9c157d0baa8