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Chevy K2500: My front axle will not engage on my 98 Chevy K2500.

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My front axle will not...
My front axle will not engage on my 98 Chevy K2500. I re[laced the actuator and transfer case switch but no luck.
Submitted: 2 years ago.Category: Chevy
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Answered in 3 hours by:
6/8/2015
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 17,496
Experience: 15 years GM master tech
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Welcome! My name is ***** ***** I will do my best to assist you with this problem.Ask me about added features such as phone contact anytime if you wish !+
I am sorry for the long wait
is this a black plastic front actuator or a silver aluminum one ?
if you remove the actuator then hold it in your hand and plug it back in then turn the key ON and shift it into 4HI will the acutator visually extend out ?
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Customer reply replied 2 years ago
It is the black plastic one. I took it out and engaged the lever but it does not extend. I'm getting 12 volts on two of the pins on the connector.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
ok how many wires at the front actuator and what colors ?
then with the key ON what colors show 12 volts then when shifted into 4HI what colors show 12 volts ?
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Customer reply replied 2 years ago
In both cases only the brown wire has 12 volts.
Customer reply replied 2 years ago
Sorry 4 wires. Black/gray ,black ,brown , brown/black
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
is the black a good ground ?
will the grey/black show a good ground when the key is ON and the truck put into 4HI ?
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Customer reply replied 2 years ago
Black and black/g
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
if the brown is a confirmed 12 volts with the key ON and the solid black is a good ground and the grey/black only shows a ground when shifted into 4HI tat is everything that front actuator needs to operate when visually holding in your hand it should extend out when plugged in and shifted into 4HI
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Customer reply replied 2 years ago
The black & black gray both read 12 volts to the brown wire. And they both read 20&50 ohms to chassis
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
that is a lot of ohms to chassis
can you check and see if the grounds G105 as seen here are confirmed clean and tight and NONE of the grounds are broken or loose ?
cut and paste this link for the ground location
https://onedrive.live.com/redir?resid=B44D0F00649BC959!1056&authkey=!ANInf0xACLPyNOs&v=3&ithint=photo%2cgif
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Customer reply replied 2 years ago
I just jumped 12 volts off the battery to brown pin and minus to black and black/gray and nothing moves
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
at this point you have everything there for the actuator to operate
is this a floor shift or push button switch ?
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Customer reply replied 2 years ago
Floor shift
Customer reply replied 2 years ago
I already exchanged the actuator once at advanced auto parts but if one is bad perhaps their whole batch is bad.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
this is very odd
can you tell me what the black/white wire shows ground or power ?
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Customer reply replied 2 years ago
with the key on and in 4 hi?
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
yes then with it in 2hi
the electrical schematics are tricky for these systems
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Customer reply replied 2 years ago
That wire is ground in both states
Customer reply replied 2 years ago
After checking it again the brown wire and the gray/black have 12 volts on them. The black and black/gray are ground. This is key on lever in 4 hi.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
operate out of those 3 wires
the brown a confirmed 12 volts the black a confirmed good ground then the black and grey should be a confirmed good ground when shifted into 4HI
if all 3 of those check out and the actuator will not extend out visually holding it in your hand it has to be a defective actuator
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Customer reply replied 2 years ago
I'll get another one and I'll let you know what happens
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
ok
everything is testing out correct right at the actuator for it to operate
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Customer reply replied 2 years ago
Just went to Autozone this time and got the third new actuator and still does not extend.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
lets see if another expert has any ideas
hang on another expert will reply back to you
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Gary
Gary
Gary, Chevy Technician
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Satisfied Customers: 17,496
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