morevair wrote:Sun Dec 03, 2017 2:23 pm
I'm having some lighting issues and was hoping to get some help figuring out the issue...
1966 Corsa...
tail lights work,
front signals work,
backup lights work,
plate light works,
brake light don't work,
rear signals don't work,
Changed the bulbs, they appear good...
Any help is appreciated...
brake light don't work
rear signals don't work
You are looking for a common thread that would affect both the rear turn signals AND the rear brake lights. The rear turn signals and the rear brake lights utilize the same bright filament in each 1157 bulb on both sides of the vehicle. The taillights in each of those sockets utilize the other filament in each 1157 bulb. Both use the same socket on each side for a ground return, so you know that the ground connection for each socket is good because the taillights work.
The schematic diagram below is for a 1965 Corsa. I don't have a combined schematic for the 1966 Corsa. The wiring for both model years is essentially the same with the exception of the color codes, so the color codes I mentioned in the schematic will probably not match the wiring color codes in your 1966 Corsa.
Left-click the image (one or two times) to enlarge it for better viewing or "Pan & Scan"...
- 1965 Corvair Corsa Full Schematic
CORVAIR COMBINED WIRING SCHEMATIC DIAGRAMS
viewtopic.php?f=225&t=12968
In the diagram, the wire labeled
20 B/Y (20gauge black with yellow stripe) can be found connected to the left side tail and directional lamp. This is the wire that powers your left side turn signal/stop lamp. The other wire, labeled 20 BRN/T (20gauge brown with tan stripe) is extended from the left tail lamp to the right tail lamp, and powers both tail lamps. The right side turn signal/stop lamp is powered by a wire labeled
20 DG (20gauge dark green). The two sides are wired individually because of the need to be able to control the turn signals individually.
The rear brake lights both have a common point of origin at the stop lamp switch that is activated by the brake pedal (connected to switch post B+ in the image below). With the turn signal switch in the off position, the connecting strips between the B+ post and the left rear post (LR) and the right rear post (RR) are normally connected to pass the voltage from the stop lamp switch at the brake pedal straight through the turn signal switch and on to the rear filaments in the 1157 bulbs. Activating the turn signal for right or left temporarily interrupts the connection on the selected side so that is no longer is in contact with the B+ post. Instead, a connection strip moves to come in contact with the turn signal voltage (TS+) that originates at the fuse block from the turn signal flasher. The same motion also pushes the connection strip into contact with either the right front (RF) or the left front (LF) post, so that the intermittent (flashing) on/off voltage from the turn signal flasher is connected to both the front and rear 1157 bulbs on the selected side. The other side remains in contact with the stop lamp switch at the brake pedal for the rear 1157 bulb that has not been reassigned temporarily to the turn signal function. This would allow a driver who was following behind to see a flashing turn signal on one side and a continuous stop lamp indication on the other side at the same time, which would occur if the Corvair driver was applying the brakes in a turn.
Since both of your front turn signals are functional when activated by the turn signal switch, you can assume that the turn signal voltage at the TS+ post is being properly provided by the flasher in the fuse block, and that the turn signal switch mechanism is establishing the proper connection between TS+ and either RF or LF to take care of the right or left front turn signal. You also know that the connection between the turn signal switch in the bright filaments of the rear 1157 bulbs is never making it to those bulbs, regardless of the power source (stop lamp switch or turn signal flasher). While there could be a problem internally within the turn signal switch, I would recommend checking the multi-connectors in the circuit path first. If you look at the schematic diagram you will see a curved eight pin multi-connector below the fuse block in the diagram. This curved multi-connector is the connection point on the steering column between the turn signal switch and the rear 1157 bulbs (20 DG and 20 B/Y). This curved multi-connector is one possible circuit interruption point. The two wires continue on and pass through a 12 pin multi-connector behind the dashboard that connects to the rear wiring harness. The two wires continue on towards the rear of the car and pass through yet another 12 pin multi-connector in the engine compartment.
If you have a multimeter, you can separate the two halves of the plastic multi-connector in the engine compartment and check for brake or turn signal flasher voltage on the firewall side of the multi-connector at the appropriate pins. If you detect brake light voltage coming into that connector when someone steps on the brake pedal, you know that the circuit is good all the way to that connector. Check for corroded or bent/damaged pins within the connector shell that would be causing a circuit interruption at that point. If you do not find voltage there, you will have to check further forward at the two connectors that are behind and under the dashboard. If your testing fails to locate stop lamp voltage or turn signal voltage at the curved connector on the steering column, your problem is likely within the turn signal switch itself and you will have to remove the steering wheel to access that switch and examine/replace a faulty turn signal switch.
Late Model (LM — 1965-1969) Corvair, the "guts" of the turn signal switch are buried in the steering column.
- Late Model Corvair Instrument Panel Wiring Connector
- 1965-1969 Corvair Engine Compartment Wiring Harness Segment - Multi-pin Connector
- 1965-1969 Corvair Engine Compartment Wiring Harness Segment - Multi-pin Connector.jpg (34.19 KiB) Viewed 1728 times
- 1965-1969 Corvair Engine Compartment Wiring Harness Multi-pin Connector
- 1965-1969 Corvair Engine Compartment Wiring Harness Multi-pin Connector.jpg (33.79 KiB) Viewed 1728 times
http://www.corvair.com/user-cgi/catalog ... IN&page=87
Part number C862: 65-66 & 64-65 FC DIRECTIONAL SWITCH