How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Gary Your Own Question
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 15692
Experience:  15 years GM master tech
19513769
Type Your Chevy Question Here...
Gary is online now
A new question is answered every 9 seconds

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

Customer Question

My front axle will not engage on my 98 Chevy K2500. I re[laced the actuator and transfer case switch but no luck.
Submitted: 1 year ago.
Category: Chevy
Expert:  Gary replied 1 year ago.
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 ?
Customer: replied 1 year 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.
Expert:  Gary replied 1 year 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 ?
Customer: replied 1 year ago.
In both cases only the brown wire has 12 volts.
Customer: replied 1 year ago.
Sorry 4 wires. Black/gray ,black ,brown , brown/black
Expert:  Gary replied 1 year 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 ?
Customer: replied 1 year ago.
Black and black/g
Expert:  Gary replied 1 year 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
Customer: replied 1 year ago.
The black & black gray both read 12 volts to the brown wire. And they both read 20&50 ohms to chassis
Expert:  Gary replied 1 year 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
Customer: replied 1 year ago.
I just jumped 12 volts off the battery to brown pin and minus to black and black/gray and nothing moves
Expert:  Gary replied 1 year ago.
at this point you have everything there for the actuator to operate
is this a floor shift or push button switch ?
Customer: replied 1 year ago.
Floor shift
Customer: replied 1 year ago.
I already exchanged the actuator once at advanced auto parts but if one is bad perhaps their whole batch is bad.
Expert:  Gary replied 1 year ago.
this is very odd
can you tell me what the black/white wire shows ground or power ?
Customer: replied 1 year ago.
with the key on and in 4 hi?
Expert:  Gary replied 1 year ago.
yes then with it in 2hi
the electrical schematics are tricky for these systems
Customer: replied 1 year ago.
That wire is ground in both states
Customer: replied 1 year 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.
Expert:  Gary replied 1 year 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
Customer: replied 1 year ago.
I'll get another one and I'll let you know what happens
Expert:  Gary replied 1 year ago.
ok
everything is testing out correct right at the actuator for it to operate
Customer: replied 1 year ago.
Just went to Autozone this time and got the third new actuator and still does not extend.
Expert:  Gary replied 1 year ago.
lets see if another expert has any ideas
hang on another expert will reply back to you