1995 k2500 4x4 not locking in - Truck Repair Advice


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1995 k2500 4x4 not locking in

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and01588
New User

Jun 8, 2014, 10:56 AM

Post #1 of 4 (2175 views)

1995 k2500 4x4 not locking in	Sign In

I am having trouble locking in 4x4 on my 1995 chevy k2500 6.5TD. I have replaced the T-case switch and tested the actuator (hooked it straight to the battery and it extended). Voltage to the actuator is initially ~12.4 but after a few seconds it drops to ~3.7. What is causing this? I assume it is my issue with the actuator not extending.

Additional info: It is a floor shift, 2x4 light is on regardless of gear selection. There is 3 volts at the 4x4 dash fuse.

(This post was edited by and01588 on Jun 8, 2014, 12:19 PM)

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jun 9, 2014, 2:48 AM

Post #2 of 4 (2137 views)

Re: 1995 k2500 4x4 not locking in	Sign In

Quote

There is 3 volts at the 4x4 dash fuse

That might be a problem. If your meter is connected to a good ground, you should be seeing near battery voltage. Is the voltage the same on both sides of the fuse? What is the voltage on the heater AC fuse 12 (25 amp)?

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jun 9, 2014, 2:49 AM)

kev2
Veteran
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Jun 9, 2014, 2:52 AM

Post #3 of 4 (2134 views)

Re: 1995 k2500 4x4 not locking in	Sign In

do you know which transfer case - several were used with the dual rear wheels and 3500 series, some even had relays etc..

The voltage drop you are measuring the chassis connector with actuator unplugged? THe actuators would often fail I will look for a ohm spec.

and01588
New User

Jun 9, 2014, 8:09 AM

Post #4 of 4 (2118 views)

Re: 1995 k2500 4x4 not locking in	Sign In

It turned out to be a bad ignition switch. I followed the 3 volts (one side of the 25amp fuse with the actuator unplugged) large orange wire coming out of the fusebox to the ignition switch. All other wires had 12 coming out with key on. I wired the rear wiper(none on the truck) brown wire to the orange one everything is working until the parts show up.

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