Question about 2004 GMC Sierra Denali
NEED TO HAVE CODES CHECKED, MOST COMMON IS
TRANSFER CASE ENCODER MOTOR
Posted on Dec 28, 2013
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Posted on Jan 02, 2017
SOURCE: four wheel won't engage
Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)
Posted on Dec 29, 2008
Good Evening. So from the sounds of it you say the hubs are not engaging, which means you probably checked the driveshaft and saw it moving. There is a actuator on the right hand side of your front differential and has plug in with 2 wires going to it. First off take a test light and hook it between the wires start the truck and be sure it is in 4wd and if the light turns on you need to replace the actuator which is a common replacement item. We only use the 88 and newer chevrolet trucks for our snow plows so I have seen this too many times. If there is no power there is a fuse in the fuse panel then take your test light and check them as well. I hope this helps you.
Posted on Aug 11, 2010
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