So Fix it

Properly implemented, either single or dual exhaust systems can perform well on most any truck. The question largely comes down to matter of perence in sound, appearance and budget.

Horsepower

Horsepower is a matter of exhaust flow, and it matters little whether that flow issues through one big pipe or two smaller ones.

Sound

Because dual pipes split the flow, it is easier to hear the sound of individual cylinders firing. Many people per some sort of dual exhaust for their more analog exhaust note.

Budget

Most people who replace a trucks exhaust system will opt not to use a true dual exhaust system, because often the entire system must replaced, from exhaust manifold to tailpipe.

Velocity and Torque

If there is one good argument for dual pipes, it is that using two smaller pipes will cause an increase in exhaust velocity, which may help boost torque for towing.

Turbodiesels

Almost all turbo-diesel trucks work best with a single large exhaust pipe, since the turbo only has one large exhaust outlet anyway.

The 1969 Chevrolet truck has two headlights. Theore, each headlight will have two filaments built in; one for the high beam and one for low beam. Headlight failure was prevalent on some early vehicles. The dimmer switch on these vehicles mount on the floor and exposes the wiring and connections to an abundance of moisture and corrosion. Another issue was the actual headlight switch or the plug that connected to it would heat up and the connection would fail. Headlight failure is unacceptable, and all issues should be addressed and corrected to maintain safe driving.

Instructions

1

Put on safety glasses. Remove at least one headlight bulb, using a screwdriver to remove the hold-down ring around the headlight, and test it. Connect a jumper wire between one of the parallel prongs of the headlight and the positive terminal on a 12-volt battery. Connect a second jumper wire between the negative battery terminal or a grounded engine component and the single prong below the two parallel prongs. If the light is bad, replace it.

2

Inspect the entire fuse box for any blown or discolored fuses. The fuse box on a 69 Chevy truck is located under the dash on the drivers side of the truck. The 69 Chevy truck uses a glass tube fuse.

3

Inspect the ground wire, which bolts to the radiator support behind the headlight socket on most older vehicles, for a good connection. If the connection is burnt or discolored, unbolt it with a wrench and clean it with a wire brush. Most models have a small black wire that mounts to the chassis with a 5/16-inch self-tapping metal screw.

4

Charge the Chevy trucks battery with a charger or by running the engine for 15 minutes. If you are charging the battery, the red terminal of the charger should be connected to the positive terminal, and the black terminal connects to the negative terminal of the battery.

5

Pull the headlight switch to full-on position. If the switch is pulled out halfway, it lights the parking lights only. Click the dimmer switch several times; take notice as to whether the high-beam indicator lamp in the dash lights up. If the high-beam indicator lights up, test the dimmer switch.

6

Roll back the carpet or floor mat around the dimmer switch, found on the truck floor. Locate and remove the connector plug. Use two jumper wires and join all three wires of the dimmer switch plug together. If the headlights come on, replace the dimmer switch. If lights do not come on, check the plug with a 12-volt test light for a hot wire. One wire in the plug should light the test light unless the headlight switch is bad. Be sure the test light is grounded to a metal ground.

7

Remove the headlight switch. The main mechanism of the switch is behind the dashboard and the pull knob is on the outside of the dashboard. From under the dashboard, press the spring-loaded tab, located on the switch mechanism, and rotate the headlight switch to the left to activate the interior lights. The switch must be rotated to pull the knob and rod out of the switch mechanism. Unscrew the thin nut on the front side of the dashboard that holds the switch in the dash with a box-end wrench. Drop the switch below the dashboard and unplug it.

8

Probe the headlight connector plug with a 12-volt DC test light until the hot wire is found. If no hot wire is found, check the plug that comes through the cowl near the fuse box on the cowl side of the cab. Check the plug and headlight switch for heat related failure, melted or discolored wires.

9

Inspect the wiring harness plugs, on the firewall side of the cab, that go through the firewall, for burnt or discolored wires. These wires are located around the area where the steering shaft comes through the cowl.

10

Trace the wiring harness from the headlight bulbs or headlamps back to the cowl, checking for cracked, frayed or burnt wires. If any damaged wires are found, replace or repair the wiring harness.

Removing a steering wheel from 1990 Chevrolet trucks requires a specialized pulling tool. You will need this puller because hammering on the shaft can cause damage. You might have to remove the steering wheel if you need to do repairs on the steering system or components in the dashboard or instrument cluster. Experienced home mechanics can do the job in a few simple steps.

Instructions

1

Pop the hood on the Chevy truck and disconnect the negative cable from the battery. Wait two to five minutes so residual power drains out of the truck. This is a safety precaution because you will be working with electrical components. Also, this will temporarily disable air bags, if the truck is equipped with them.

2

Pry up the horn pad with a screwdriver. You might want to use a screwdriver with the tip wrapped in tape so none of the screwdrivers edges cause any accidental damage.

3

Disconnect the horns grounding wire.

4

Remove the nut from the center of the steering wheel with a socket wrench.

5

Inspect the shaft of the steering wheel for any markings that denote position. If see any, mark the shaft yourself. It will help you reinstall the steering wheel correctly.

6

Fit the pulling tool at the center of the steering wheel. Turn it until the steering wheel becomes detached or can be pulled from from the shaft.