1973 Wiring problems - hazards and lights

[Sparky73]

I am working on my 1973 911 Targa, it's been a ground up restoration. I have all new wire harnesses from Restoration design. that's the good part. I can't figure out what's going on with my lights, blinkers and hazards. I actually have gone backwards

Here is what's going on
Hazards work when the ignition is off or on - standard slow blink of front and rear parking lights

With ignition in the on position
blinker left or right - turns the hazard lights on - fast blinking

with the headlights on, no dash lights blink with hazards or blinkers

Pull the E-brake up and brake warning lights come on dash and hazard lights all blink

I know there has to be a mixed up wire between the headlights, hazards and headlight switch on the column

Any thoughts at what to look at. I have gone back through all my wiring and double check it's correct. I believe it is ..... but it's obviously not

Any suggestions would be appreciated.

[Sparky73]

anyone have ideas ?

[E Sully]

These might help.

https://forums.pelicanparts.com/porsche-911-technical-forum/1154724-71-turn-signal-function.html

[Sparky73]

thanks, that second diagram is helpful.
I am still struggling to figure out what's going on. Just replaced my hazard button to a new one, thought that was the issue. It's not
Also changed out my blinker switch, that solved my low/hi beam issue but caused others.

Now when I connect my battery my headlights and dash lights come on. Key is off and out of the ignition. I think something to the back of the headlight switch is wired wrong. That's all I can think of.

Any thoughts

[E Sully]

Is the harness a copy of the original? Did they supply any wiring diagrams?
Pictures of your terminations at light, ignition switch, etc. might help to see if it matches original.

[Sparky73]

It's a new wire harness from Restoration Design for my car. I have been talking to the tech guy at RD but we are yet to figure out what's going on. I think it's my connections at the back of the light or hazard. Let me take a few pictures and post them. I do have wiring diagrams but not for the back of the light switch

[Sparky73]

Here are pics of my wiring behind the lights

[Sparky73]

and pics of the Hazard switch wiring

[E Sully]

Some of the main problems come from improper grounds. Make sure the ground wires in the front fenders are clean, and the rear tail light housings.
The connections at the parking brake handle can be a bit difficult. I don't have any good pictures of that. On thing to look at while your in there is to make sure the hand throttle linkage is in good shape.





Bad connections in the light sockets cause issues also. Other threads that might help.
https://forums.pelicanparts.com/porsche-911-technical-forum/1162260-wiring-questions-76-911-a.html

https://forums.pelicanparts.com/porsche-911-technical-forum/1162788-1971-porsche-911-wiring.html

https://forums.pelicanparts.com/porsche-911-technical-forum/1161364-front-turn-signals-out-73-911-a.html

[Sparky73]

Yeah, I am checking grounds.
That parking break is interesting. When I pull the parking brake up, the red light on the dash comes on as it is supposed. the hazard lights also flash, which is not right. That's why I think something is wired wrong and it's not a ground

[Sparky73]

All new fuse panel. Everything is clean.

[Sparky73]

Here is how I hooked up the lights. Yellow post-it notes are my connections. I found this illustration online.

[Helam]

Originally Posted by Sparky73

Here is how I hooked up the lights. Yellow post-it notes are my connections. I found this illustration online.

This will be a bit complicated for him to wire. I will send a simple instructions on how to go about it shortly

[E Sully]

Your light switch looks right.

[Sparky73]

Wht/green wire #57 connects to the speedo as an indicator light. It's a green light for headlights or fogs on the front side. When that wht/green is plugged in the light is always on when the key is on. That does not seem correct.

My dash lights are also always on when the key is in the on position. Same if the lights are on or off.

Any thoughts?

[E Sully]

I see you have eliminated the drivers battery and installed 2 relays there. I know one should be the horn relay, what is the other?
The Gr/Wh to the speedometer is parking light indicator from the headlight relay. It should only come on when the light switch is pulled to the first section, and go out when pulled out fully for the headlights. Might want to verify the headlight relay is working properly. The tachometer has the high beam indicator.
Do you have the optional fog lights?
Mine has the 2 Wh/Gr shown on the right side in the diagram and the one to the rear fog light in the main harness, but the rest of the harness, relay and switch were options.





Sent PM.

[Sparky73]

I have three round relays
horn relay (near fuse panel)
fuel pump harness relay (near fuse panel)
control light relay (behind gauges)

One square Hazard relay (behind gauges

I think the Hazard relay is bad or not correct for my car (even thought Pelican says it is)

I do have an option for fogs, I disconnected the wht/green white at the fuse panel, at the gauge and at the lights. Basically deleting that out of the system




ordered two different relays for the Hazard. This relay says E49, the one I order says E24, I also ordered a genuine Porsche relay.

[Sparky73]

Here is a summary of the issues. You will see why I am thinking it's a relay issue. My headlights and blinkers work fine if I give power at the fuse panel and unhook the dash wiring.

[E Sully]

This thread touches on the relay issues.
https://www.early911sregistry.org/forums/showthread.php?171471-1972-911-Flasher-Unit

[E Sully]

I looked at some of your past posts. You seem to have a bit of a project car going. I see posts for aftermarket light housings, ignition switch, '76 engine build, and you mention having a fuel pump relay which would not have been used in cars till later '70's.
You also seem to have had an issue with the multi function switch and aftermarket horn, steering column ground. You have purchased a wiring harnesses from Restoration Design. What harness or harnesses did you buy, and did they supply any documentation?
Also, don't discount ground issues. They can cause all sorts of issues if not correct. There are 3 main ground points in a 1973. One on the bulkhead by the drivers side frunk hinge, in the drivers fenderwell, and by the electrical panel in the engine compartment.
Also the rear light housing grounds by the rear bumper mounts.