Top 10 1992 Chevrolet K1500 Questions & Answers

On the fuse panel does it say they are on the same fuse?

I have a 92 Suburban with the same issue (been going on for about a year) AC will turn on when hit a bump in the road... and off with the same type of bump...

I had researched just about everything including replacing the RELAY behind the glove box...

this still didn't help...

finally after replacing most the hardware... I started tracing the wires and found that there is a plug under the glove box there there is a HOT (red) wire that was overheating due to a bad connection and it was melting...

here is where my plug is...
- open the glove box & remove the door
- remove the screws on sides of glove box and remove the glove box it's self...
(you should now see many wires and things)
- now this is where I replaced the relay... I think it was the middle one... if you replace it you will want to refer to a manual or call a dealership to make sure you replace the right one... (it was like $24 or $27)... here is a link to what the relay looks like...
-then if you follow the RED wire out of that relay.... about 3 feet of wire or so.... you will find a connector... with 5 Wires (Mine are colored - Red, Orange, Lime, Black and Green)

** this is the connector that seems to be my problem

Either Replace the Connectors or the (cheap way to fix it is remove the connector and clamp and/or sodier each of the 5 pairs of wires together without the plug... )

I am currently waiting for a new plug from my local dealer but I have bypassed the connector and manually connected the wires until the dealer gets the connector get it...

Hopefully that helps...

the 4x4 do not engage in my1990 chevy pick up what i need to check

Check your MAP and TP sensors. Your throttle body may be having trouble determining position and is compensating by adjusting RPMs.

Please check all of your fuses,There are 2 fuses for your radio,1 to supply ignition switched power and the other is a constant power supply for the radio memory.This fuse is usally a shared fuse with other devices that need constant power such as interior lights.

On the full size, the front actuator is electric, not vacuum.

When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts. The actuator may not be fully engaged or disengaged and the fork to the spline may be what is causing the grinding.

88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 1994 CHEVROLET FULL SIZE
PURPOSE: IMPROVE AXLE CONNECT ENGAGEMENT TIME AND
COMPONENT RELIABILITY.

SYMPTOMS: NO FRONT DRIVE AXLE ENGAGEMENT WHEN SHIFTED INTO 4X4.

Obtain the following GM part numbers:
(1) 26060073 Actuator
(1) 88959465 Harness/Spacer Kit

The best way to get a wiring diagram for your truck is to buy a Haynes manual (about $25) for your truck at the auto part store. It'll give you a lot more than just the wiring diagram.

under the hood on the fire wall, on the passenger side of the truck should be a black cover that looks like a big T. if you look on that there should be words that say fuel pump fuse. remove the cover and directly under it should be the fuse holder. there should be a black plastic clip covering the fuse for the fuel pump. if you have any problems please contact me.

Under the black plastic panel on the firewall above the heater hoses under the hood there is a fuse and a relay for the fuel pump.

80W-90