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4x4 Issues

j_vangeystel

By j_vangeystel
in Ask A GM Technician

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j_vangeystel Enthusiast

j_vangeystel

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I have a 96 GMC Sierra and am having issues with my 4x4 engaging, its a manual shift, manual transfer case and already has the newer actuator, the actuator has been replaced, as well as the switch right on top of the transfer case directly above the linkage, that i beleive is the switch that sends the signal for the light on floor inside the cab. I also noticed there is a switch on the back half of the transfer case, and those wires run with all the other 4x4 wires, and lead to what seems to be maybe another actuator, that is right above the 4x4 actuator that has been replaced, on the front differential. It is a smaller 2 wire switch that screws in on the backside, right above the actuator, and the switch on the back of the transfer case is very similiar to the one i already replaced. The wire colors are purple and green, and for some reason i am not recieving power to either switch. Both the actuator, and the switch on top of the transfer case have power, but when i engage the 4x4 neither of them are working. Does my issue lie within one of the other 2 switches? and what would cause those 2 linked switches to not have power? i hope this is understandable haha cuz i am even a little confused after reading back through it and iam the one explaining it, haha any help would be greatly appreciated.

Spaceclutch New Member

Spaceclutch

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Is the light on the floor of the cab coming on that it is engaged when you try to shift into 4-wheel drive? If not, you might check the actuator fuse. Mine blew this winter just in time for a record snow storm, of course! I had to wait a week for the streets to clear and take it into the shop. They found the blown fuse and replaced it for free. What great guys! My 4-wheel drive has been working perfectly since then.

j_vangeystel Enthusiast

j_vangeystel

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Is the light on the floor of the cab coming on that it is engaged when you try to shift into 4-wheel drive? If not, you might check the actuator fuse. Mine blew this winter just in time for a record snow storm, of course! I had to wait a week for the streets to clear and take it into the shop. They found the blown fuse and replaced it for free. What great guys! My 4-wheel drive has been working perfectly since then.

 

No the light is not coming on, but the fuse is fine, unless there is another fuse for it somewhere, but the fuse inside the fuse panel is fine, is there an actual fuse for the actuator as well? or just the fuse inside the cab of the truck?

Spaceclutch New Member

Spaceclutch

Posted
Posted
Is the light on the floor of the cab coming on that it is engaged when you try to shift into 4-wheel drive? If not, you might check the actuator fuse. Mine blew this winter just in time for a record snow storm, of course! I had to wait a week for the streets to clear and take it into the shop. They found the blown fuse and replaced it for free. What great guys! My 4-wheel drive has been working perfectly since then.

 

No the light is not coming on, but the fuse is fine, unless there is another fuse for it somewhere, but the fuse inside the fuse panel is fine, is there an actual fuse for the actuator as well? or just the fuse inside the cab of the truck?

 

 

Yeah, that's the only fuse I'm aware of. With the light not coming on and nothing engaging, a power issue makes sense. If you didn't spot any noticeable pinching/melted wiring causing shorts and the voltages are good when tracing and testing the wiring, it may be one of those switches. Unfortunately, I'm not much help in that area. I don't know enough about how it all works together to point you in the right direction to begin troubleshooting it. Hopefully someone on this forum is knowledgeable in this area and can be of more help than me. Sorry I couldn't be of more help.

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