Need some help sorting out fuse panel wiring -'83 SC

[pampadori]

my brake lights do not flash with hazards or turn signals on my '83.

I did run into a similar issue though where my right front signal would light up when I applied the brakes. Turned out to be a case of a single filament bulb inserted in one of the sockets that required a two filament bulb. The single contact on the bottom of the bulb was basically touching both prongs in the socket.

So check all parking, brake, and turn signal bulbs and make sure they match what the sockets are.

[Ayles]

Originally Posted by tirwin

Just to clarify... neither of your brake lights flash, right?

Oh... I don't know if it's brakes or turn signals...

I do have lights flashing at all four corners of the car when I activate the emergency flasher switch.

[tirwin]

Originally Posted by IMR-Merlin

tirwin, do you have a powerprobe? I can not praise this tool enough for chasing wiring issues.

No, but I may pick one up.

[tirwin]

Originally Posted by Ayles

Oh... I don't know if it's brakes or turn signals...

I do have lights flashing at all four corners of the car when I activate the emergency flasher switch.

If it's the corners then it's the turn signals.

This is a really minor thing, but I discovered in the process of troubleshooting this odd behavior. I haven't touched these wires, so it must be an old problem and I never noticed it until now.

HAZARDS ON - LEFT SIDE
Front parking light - blink correct
Front side marker light - no blink correct

Rear parking light - blink correct
Rear side marker light - no blink correct

HAZARDS ON - RIGHT SIDE
Front parking light - no blink wrong
Front side marker light - blink wrong
H4 city light - blink wrong

Rear parking light - blink correct
Rear side marker light - no blink correct
Brake light wrong

[Ayles]

Here is a good write up of the emergency switch. Mike maybe someone you want to reach out. He has helped me with a few things in the past.

Understanding the Emergency Flasher Switch

[evan9eleven]

Originally Posted by tirwin

Group #1: red/black & red/white wires in a pair EDIT: SOLVED. Constant hot needs to connect to power window relay pins 86 (red/white) and 30 (red/black)

Group #2: black & black/red (can't find this at all in any wiring diagram)

Group #3: red

All 3 are in the end of the fuse panel near the fuel pump relay.

Hi Tim! Hoping I can contribute a little for all the times you've made me pee my pants laughing with your wit.

I have the red/black wire labeled as hazard flashers both top and bottom of fuse 17, and I don't believe I have any plain black wires on the top side of the panel. Plain black on the bottom side are rear window defog and fresh air blower (fuse 12), and cruise control (fuse 15), and trunk light (fuse 18), and power window relay (fuse 21.)

I found a few things not on Fred's diagram that were on the bentley diagrams or in the owners manual, these were as follows: NOTE, there are other connections to these fuses as well, these are just the extras I had written in.

Flasher relay (fuse 11)
Cig lighter (fuse 13)
Sunroof, rear wiper (if installed) and power mirrors (fuse 14)
Brake lights and cruise (fuse 15)
Hazards (fuse 17)

Here is a pic of my old panel before I rewired it, US 1981 SC. maybe this helps?




And a little plug for Fred, these panels are really nicely made and now my wiring is neat, fused correctly and safe! So glad I installed one of Fred's panels-- my car was a fire waiting to happen. A/C fans were direct to hot, no fuses and the condensor fan was melted into a blob!

[tirwin]

Originally Posted by evan9eleven

Hi Tim! Hoping I can contribute a little for all the times you've made me pee my pants laughing with your wit.

That is fanstastic! Thank you very much!

I'm hoping to get back to troubleshooting in a little while.

So here is something else to humor you.

I was working late last night or sorting this wiring and while I was inspecting the fuse panel I kept hearing this loud ZZZZTTT sound. The first time it happened I was touching something so my first reaction was I had some kind of short. Then I kept hearing it but I wasn't touching anything.

ZZZZTTT!!!

ZZZZTTT!!!

I started hunting all over the car looking for where the sound was coming from.

Then I realized it wasn't coming FROM the car, it was just NEAR the car. I traced it further to a stack of boxes. ZZZTTT!!! It was getting louder.

Then I saw this little guy. It's a cicada. Think of a fly on steroids. It's body is a little bigger than a walnut. He got his wing stuck to a piece of shipping tape on the box and he was flopping all over the place mad as hell.

[tirwin]

I learned something.

The power window relay has to be in place for the horn to work.

[hotaru]

Hi,
Not sure if this will help - it is 1983 SC Cabriolet, should be all original wiringmodel for Japan - should be same as US)

[tirwin]

Thanks, hotaru! That is very helpful too.

So, the only black/red wire I've seen is in the pic that Ayles posted. I will have to go back and look again at the wiring diagrams but I only saw a couple of black/red wire references and I don't think any connected to the fuse panel. I'll have to trace it out and see where it goes.

I've traced out a labelled most of the wires that I was confused about. There were some connections hidden behind the panel that I wasn't sure about.

When I was running the new A/C hoses the other day I found what appeared to be an alarm siren in the belly pan. Not sure if it was original or aftermarket but I don't think there are any other remnants left. I'll have to look up some threads on alarm systems to see what might be involved.

[M491Cabriolet]

Hello, Tim. I followed your chart, which is great, and have the same problem - no spark. How did you end up resolving this? Thanks.

[M491Cabriolet]

Hey. Ok, since I got no response, I decided to go ahead and start all over again. The car starts right up now, but keeps running after I switch it off, until it runs out of gas because the fuel pump stops when the key is in off position.

Sooooooo..... I think the ignition is getting a 12 volt feed with the key off. I can’t figure out which wire in the frunk fuse box is the culprit. Any ideas?

Thanks!