I first saw it on the 1981 build sheets, but I could not find any reference to it in the shop manual. Fuses do not fail without a reason. They also used a toggle switch to dim the turbo boost lights on the hood. This harness was eliminated in 1980. If a circuit is open, then the circuit is off. I did use the orange ignition wire for the volt gauge. They should have planned better! Listed below is a terrific image for 1978 pontiac trans am wiring diagram.
This Tech Tip is From the Full Book,. Do they look original to you? The late 70's Firebirds had separate key and seat belt buzzers. Differences in Basic Harness Components Two of the five pieces of the basic wiring harness could have some variation. Year to year differences on the rear defrost are confusing and difficult, but lucky us I found the technical service button that clears it all up! Also note the ground wire bolted to the dash pad. This is the Pontiac version. It should be obvious that the front and rear lamp wiring changed in 1979 when the cars were restyled.
Here are the fuse block and cross-body conduit actually on the car, showing how the optional wiring runs up to the cross body conduit. All routing of the harnesses should be in the same layout as those you remove. The warning tone generator grabs the plugs of both those components, plus it plugs into the console lamp terminal so it'll know if you left your lights on. We hope whatever we give to you could be useful. The 1981 full-blown engine control computer used the same hole for about 50 circuits. On the passenger's side, it is routed over the glove compartment in a special wiring tray on the back of the dash pad. I let this one go to the crusher, but I would have kept it if I had realized this is a special harness that powers two options.
. The only thing that I did was swap wires and the different places is in the diagram on the white cluster connector. However, you should still have the flashers and the back-up lights if this brown wire is disconnected somewhere, assuming it's the main wire from the terminal before it branches out. The electrical system in your Firebird is the key to making the mechanical components operate at their best. Until you turn the headlights off.
In 1980 the tach wiring was integrated into the standard harness. It was taped together with a vacuum hose going to a vacuum breaker on the brake pedal. . Note the red spring clips holding these wires in. All the cars have the wiring for this, so it is just hanging loose if you don't have rear defrost. .
The extension is shown here with the switch and the plug that it connects to. If the circuit is closed, the circuit is on. It is clearly labeled with the circuit that the fuse protects along with the proper amp fuse. In addition to turning on the compressor clutch, this harness grounds the whole system through the lug shown and connects to an idle solenoid on the carburetor. If you are replacing the harnesses, you most likely do not require the services of a shop. The power wire through the ignition a … ccessories portion is orange. The heavy brown wire is the power supply for the heater.
This wire plugs into an inconspicuous green circuit just above the fuse block. The ground lug doesn't show clearly in this photo, but I think it's the wire running off the top of the picture. Electrical systems are time consuming and, in some cases, challenging to diagnose. Troubleshooting electrical problems for ignition switches, lights, and motors can be handled with some basic tips. Note that the wiring to the rear body is in a black conduit.
The location of this screw is shown here. . The short orange wire right of center is for a power deck lid release, and the lamp with its metal bracket and black push button is obviously for the glove compartment. So, in 1981, no matter how many options you had, you couldn't get enough toggle switches to fill up the instrument panel. Car should fire up with very little adjustment of the distributor. Tighten the battery cable nut to 84 inch lbs. Remove the screws that hold the signal light mechanism, and the signal light handle has to be removed.