You can purchase a multifunction digital multimeter at a tool supply store. The 1980 spark control computers had used separate harnesses that didn't connect to anything in the main harness. Basic Wiring Harnesses for 1977-81 Trans Ams Wiring Harnesses 101 Or, my volt gauge is dead, and I don't feel so good myself. The wire tie in the photo is original, and is holding the I. If the green indicator lights, the pink and black wires are reversed. The rear window is grounded on the passenger's side by a braided ground cable and a screw.
It was a very short distance from this hole to the actual antenna motor. This is another one of those things that would fit a 77, even though it came out in 1981. Click the button below and we will send you an exclusive deal on this book. This illustration is really intended to show the plugs in the main I. 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. One plug was for the front speakers, one for the rear speakers, and one for power, lights, and so forth. Our wiring harnesses are correct in every detail.
Note that the wiring to the rear body is in a black conduit. The sleeve around the main branch of the harness shows where the steering column was. The tach wiring was separate until sometime in 1979. Sometimes, if the failure was particularly violent, the glass is dark. Ask me how I know! The interior lamps were combined into a single harness that plugs into a three-prong plug just to the right of the radio. The old and new switches look identical from behind, as long as one is right side up and the other is upside down. Everything's black in this photo, so it's not easy to see.
Unfortunately, diagnosing an electrical problem is not as simple as finding a blown fuse. This view of the back side of the dash pad shows the antenna relay mounted above the glove box and the rear defrost relay mounted on the driver's side edge of the glove box the right side of this view. These harnesses will provide the finishing touch for any original or restored vehicle. The deluxe lamp group consisted of floor courtesy lamps, glove box lamp, and trunk lamp. So, to summarize, the 1980 and 81 harnesses are each totally uniquie. I bought actuators for my 1985 El Camino only to notice they were identical to my 1980 and 1981 cars. Fuses do not fail without a reason.
On automatics this allows your car to start only in Park or Neutral. Hey, I do a lot of aftermarket stuff for car dealerships. Since the radio plugs are usually cut off anyway, the 1978 I. The starter system typically has a relay in it. Note the the antenna cable rolling out from under the harness. It was taped together with a vacuum hose going to a vacuum breaker on the brake pedal. 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.
This is routed to the yellow button in the glove compartment, and from there a black wire runs to the solenoid in the trunk. The ground lug doesn't show clearly in this photo, but I think it's the wire running off the top of the picture. Only might have to make one or two new mounting screw holes? If the accessories such as the wipers, radio, fan motor, etc. This harness had only 7 circuits in it. The compressor circuit circuit runs through a pressure and temperature switches before continuing to the compressor harness. Note the red spring clips holding these wires in.
The installed solenoid is shown at right. Can somebody please refresh my brain. The fuse box is accessible under the dash to the left of the brake pedal. Deciding whether or not you can tackle the repairs on your electrical system greatly depends on your understanding of how electrical systems work. This same harness also powered the trunk release.
In 1980, the harness also had a 2nd brake light switch for the cruise control and a green wire top for the rheostat on pulse wipers. In addition to the obvious dimmer, headlight and wiper switches, this part of the harness has connections to the rear window purple in 1980 , driver's seat belt reel switch black , and driver's door jamb switch next to the courtesy lamp. Just turning off the power to the cruise wouldn't be quick enough. Wiring for the cruise button, shown here, comes out of a hole at the base of the stalk and is routed through the steering column. Through 1979, the tach required an extra harness for power and to connect to the distributor. Second is an orange and brown pair of wires that fed a digital clock in the top-of-the-line stereo. In the photo, the 1980 wiring and coax cable are shown together.