94 GMC Seirra 4x4 will lock in but front tires won't engage
I found the fuse blown so i change it and it worked for a while now the front wheels will not engage, fuse is still good so could it be my actuator. If any one can help solve my problem leave me an e-mail i would greatly appreciate it.
Re: 94 GMC Seirra 4x4 will lock in but front tires won't...
One simple thing you can do is to check for power at the actuator. With the truck NOT running, move the transfer case selector into 4wd then trun on the key to the hot posistion. Using a test light,check for power at the plug. The hot wire is the brown wire. If you do have power at the actuator, the the actuator itself is most likely bad. If you dont have power, then the switch in the transfer case is bad. Your best bet for a new switch is GM. The local parts places usually have no clue about what you'll want. If you have more questions......email me at email@example.com
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Start by checking fuse #7 a 15amp fuse in the fuse block under the left side of the dash. This fuse is for the accuator motor on top of the left front axel tube. The accuator moter engages and
disengages the front axel for 4wd and 2wd. If the fuse is good, have someone operate the switch
and check to see if the accuator is working, you should be able to hear it engage or disengage.
If it's not working check the connections and for power at the accuator before possibly changing it.
If the accuator is working, it could be a problem with the shift fork inside the differential. Also, have
someone start the truck and engage the 4x4 then look to be sure the output shaft from transfer case to the front axel is turning. The safest way to do this is to have all 4 wheels up on jack stands.
Hope this is helpful.
There is a gas canister on the front differential that engages the hubs for 4wheel drive. make sure it is functioning properly. It works by way of heating the gas in the canister which forcess a rod to slide and engages the front diferential. During the cold months it takes longer to heat the gas in the cylinder and sometimes won't allow the diff to engage. Check to make sure it is functioning it is located on the inside right hand side of the front differential.
If the transfer case is engaging, try it in 4X4 low foot on the brake and other on the gas (power braking) and you can get the rear tires to break loose your 4 wheel drive actuator switch is bad, a common problem on these 4X4's. It is a simple repair and is located on the front differential.