Question about 1988 Chevrolet Silverado 2500

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Power windows and door locks dont work

I recently bought a 1988 Chevrolet Silverado. The radio doesnt work, the intruments on the dash work but they are all off. The speedometer only goes to 50, and the gas only goes up to a quarter. The a/c heater doesnt work. Also my power windows and and power locks dont work. I fixed other problems but these I have no idea where I would start. Any help? lol

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When you say the "instruments on the dash work but are all off", what do you mean? Does this have a conventional analog instrument panel or is it the digital cluster that was available for some models.

First thing to check would be the fuses. Locate the fuses that feed the accessories in question. Be sure they have 12volts on both sides of the fuse with the key on engine off.

Once you eliminate the fuses I'd start with the power windows and door locks. Remove the master switch on the drivers door and back probe the wires. Be sure the switch has a constant 12v and constant ground. If not, repair the open in wiring. If power and ground is present, back probe the two wires that feed either the drivers or passenger door, press the button. Using a digital volt meter verify you are receiving + or - 12 volts. If the switch isn't working, replace. If it's feeding power and ground to the correct wires remove the door panel and follow the wires to the corresponding component (power window motor or door lock actuator). Back probe those wires and pressing the switch verify that the power and ground are reaching the component. If you have power and ground to those wires replace the component and retest. If not, repair open in wiring.

You could use the same basic diagnostic approach for the other circuits as well.

Does the blower motor work in any speed, specifically high? The most common problem with blower motors are either bad blower resitors (should be mounted to the heater box in the engine bay or under the dash on the passenger side) or the blower motor itself. With this problem i'd start by checking to see if you have 12 volts at the blower motor with the speed on high. If you do and the blower motor doesn't work, replace the blower motor. If you don't have 12volts i'd check the reistors, the wiring for that can be a bit tricky so to simplify the diagnostic process i'd just remove the resitor pack and visiually inspect them for open or burnt resitors.

For the radio.. remove the radio. Verify you have a constant 12volt wire (usually red) switched 12volt wire (yellow?) and a ground (black). If all that is there and the radio still doesn't turn on, the radio needs to be replaced. If not, repair wiring as necissary.

Having a service manual with appropriate wiring schematics will be of great help with solving all these electrical gremlins.

Good Luck,
Chris

Posted on Apr 20, 2009

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