4 wheel drive problem, need help

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October 28th, 2012, 7:04 PM

rksorrells

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4 wheel drive problem, need help

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ontVertAlignInTxbx/> <w:Word11KerningPairs/> <w:CachedColBalance/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="--"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument> </xml><![endif]--> I have a 99 GMC Suburban with the push button four wheel drive system. I was driving the other day and noticed none of the lights on my four wheel drive selector were lit up. I changed out the 20 amp fuse for the transfer case. I can select 4WD Hi or Auto 4WD, when I try to select 2WD while sitting still the light for 2WD flashes for a few moments then stops. 4WD Hi remains lit up. When I try to select 2WD while the vehicle is moving I get the same flashing light on the 2WD button then the 20 amp fuse blows. When I install a new 20 amp fuse the 4WD Hi light is selected. While the fuse is blowed the truck "feels like" it is in 2WD, with a new fuse in the truck "feels like" it is in 4WD (I get a little wheel hop turning a tight corner on dry pavement). I have the new style plastic actuator on the front differential. Any ideas as to what this could be? Can the Auto 4WD really be working? (I live in wyoming and we can have snow at any moment. It would be nice if this feature continued to work properly while I try to figure this problem out.) Any help would be greatly appreciated. Thanks

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October 29th, 2012, 2:20 PM

rksorrells

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the auto 4wd did not work. with the fuse in the vehicle is stuck in 4wd. help please

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October 29th, 2012, 5:24 PM

kevinkpk

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I suspect switch since you replaced (I am guessing) the shift solenoid. What speed are you trying to shift into 2wd? Also since you replaced the solenoid(assumed) recheck the wire connections. Wyoming can be a real treat without 4wd on demand.

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October 30th, 2012, 1:20 PM

rksorrells

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Forgive my ignorance. I did not know there was a shift solenoid associated with the 4wd system. I checked the wiring that goes from the dash switch down to the transfer case and there are no shorts or problems there. I replaced the dash switch and this did not fix the problem. I was told that the truck originally came with a actuator connected to the front differential that was made of metal and these had problems. I checked and the actuator has been upgraded to the plastic type (done before I bought the truck). As shifting at speed. I tried at 30mph and again at 10mph and at 0mph. Both times the fuse blowed while I was moving. While sitting still the fuse did not blow, however it refused to shift out of 4wd. If this was my vehicle I would be tempted to just insert/remove the fuse as needed, however this is the wifes truck.

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