78 SC Hazard lights and turn indicator problem

[snbush67]

This wire was wrong, I think it’s right now as shown. Why are the end connectors different? One is clear and the other is black.

The black/white/green wire comes from E3 (hazard switch) pin 49a, and connects to the black/white wire that runs to E2 (turn signal) pin 49a.



Still working, haven’t hooked up the juice yet.

[snbush67]

I’m not sure about this one. The solid grey wire comes from D (ignition switch) and it is plugged into a solid grey wire going to E1 (light switch).

Again, the end connector insulation’s are different one is black and one is clear. I had this grey wire and the black green white wires opposite before. It seemed like the end connectors should have matched up, clear to clear, and black to black. Maybe that was the problem.

So it’s like this now.

[snbush67]

These two matching thick yellow wires look like they should connect?I had then connected. I don’t see them on the diagram.

[timmy2]

Yellows are for other options/countries.
No comment on the connector cover colors. You’d have to ask the people that made them.
As long as you are sure your connections are right, might as well give it the juice…

[snbush67]

I just checked the fuses before adding the juice and a couple are blown (parking lights), they must of been like that from before I made changes. Problem is I don’t have any of the replacements, I’ll get some tomorrow and see if I can’t make it work.

[snbush67]

Still the same problem. When the lights switch is on the hazards and/or turn signals don’t flash. And it doesn’t matter what configuration I plug the wires in that I identified yesterday, the problem is the same.

There was a wire reversed on the right from side marker, that’s fixed.

I’m still not sure about the grey wire, it is hot when the ignition is off, and off when ignition is on or run.

I also tried removing lights while the lights and flasher were on, no luck, they never flashed.

The fuses are not blowing and all the lights work but don’t flash when both switches are on.

This might be something …. The small bulb in the headlight housing (parking light?) under the main bulb has a ground (brown wire) attached to the holder, but no wire for power. It’s the same on both sides, those bulbs don’t light of course, but I don't know where the power wires are, I’m assuming my car didn’t have that as an option?

Right side.



Left side.

[timmy2]

City lights wouldn’t have an effect on the flasher.
Maybe it is in the actual light or hazard switch where a contact that should stay made isn’t?

An ohmmeter and a print and a plan, to test the functions and confirm every wire in the circuit including at the fuse panel is what you need to do.
Isolate, verify and keep at it to find what is not working.

[timmy2]

Isolate (disconnect) the front right fender wiring by removing the appropriate fuses just to it, and see if the problem goes away

[snbush67]

I took out the 4 fuses to lights on the front right, same problem. So then did the left fender, then both, then all front and rear, no change.

I think that the problem is internal to the light switch, specifically when it is in the on positions.

Time to go shopping I think.

[snbush67]

After a few days of not thinking about it, I have got back at it. It probably isn’t the light switch so I’m moving past that.

The problem is isolated to the parking lights, if either the left or right, parking light fuses are in I have the issue with the hazards and turn signals going solid when signal, or hazard and the light switch is on, (It does this if the rear lights are connected or not). When I disable the parking lights by pulling the two fuses, the hazards and turn signals flash as normal.

More to follow.

[timmy2]

Do you have any led lights installed?
Just curious.
I agree it isn’t related to the switch, sounds like a wiring issue up front.
Maybe isolate the parking light wiring at the headlights with the fuses in, to see if it is past the headlight connectors.

[snbush67]

I don’t think I have LED’s. I replaced all of the lights including the dash lights, excep for the small indicators lights in the tach, I can’t tell for sure, should I just pull them out?

[timmy2]

No. Leave as is. The problem has shown itself to be in a specific circuit.

[snbush67]

Update. Things I know now that I didn’t know before. Reference pictures in post #21-23.

The yellow wire from the turn signal plugs into the yellow wire, back to the turn signal, it is the low beams. Low beams don’t come on without it being plugged in.

The grey wire from the ignition goes to the grey wire to the headlight switch. The grey wire is hot only when ignition is off.

The green/black wire from the hazard switch plugs into the green/black wire to the turn signal switch.


!!! The green/black wire flashes my test light when the ignition is on, when nothing else is switched, the corners and indicators don’t come on or flash. This is weird and probably isn’t right.

How do I check for proper ground at the flasher relay?

[timmy2]

Use an ohmmeter to test the relay base for ground continuity.
Ignition off, battery disconnected.
Remove relay, (using the wire entry to the base as 6 o’clock for orientation)
Insert one of the meter probes into the relay base socket at either the 3 or 9 o’clock position (can’t remember which one right now, one is ground the other is power)
Other meter probe to a good ground.
Should read less than an ohm on the ground wire.

[snbush67]

Ok , it looks like 3 o’clock is the ground which goes to pin 31 of the relay. Tested with power disconnected and key off.

3 o’clock = 0.0
6 o’clock= 7.5
9 o’clock = 2.5
12 o’clock = 0.L (nothing)

Test lamp with power on at the relay pins with the hazards on.

3 o’clock, 31 pin = nothing
6 o’clock, C pin = blinking
9 o’clock, 49 pin = solid
12 o’clock 49a pin = blinking

And with the hazards and the lights on.

3 o’clock, 31 pin = nothing
6 o’clock, C pin = weak solid glow, barely visible.
9 o’clock, 49 pin = solid
12 o’clock 49a pin = solid

[timmy2]

This is weird. Do you have headlight relays installed? Maybe it is something in the hi/low signal switch if not.
Can you take and post a photo of the top and bottom wires on fuse 9 and 10? (counting back from the headlights)
Also confirm Black/white and Black/green go to the center of the signal lamp bulb.

[timmy2]

There are posts here where guys have had problems with the flasher unit ground and jumped 2 terminals on the flasher, but I don’t think they had your unique situation of it only stopping with headlights on.

[snbush67]

I do not have headlight relays installed. Will take pictures and make the checks you mentioned.

[timmy2]

Just one last question. Was it all working normally before the right side fender was replaced?