Help unravel a few wire mysteries: '70 Charger Rallye Dash

[Coelacanth]

I have my instrument panel out, it's fixed and cleaned up/restored as good as possible. While it was out, I had a good look at the wiring under the dash, and spent a good couple hours following FSM info and a color wiring schematic I had to identify any potential wire issues. There are some obvious connectors with no mates as my car lacks the center speaker, currently has no stereo, there's a connector on the steering column for a cruise control I never had, and probably a connector for A/C, which I never had.

That said, I found a few mysteries that hopefully someone can help me unravel.

My car used to have an alarm system that was long ago removed. I also have removed all the wiring to the stereo and speakers I used to have. But these 3 mysteries have me confused.

This 3-spade connector with parallel-aligned spades has no mate anywhere. Looking at the yellow, yellow w/brown tracer, red and grey (?) wires, does anybody know what this might've been used for?

This single-spade yellow wire hanging off what I believe is the delay-relay, with yellow and pink wires...what might this connect to, if anything?

And lastly, this purple wire hanging loose from the brake switch, where it was spliced into one of the pink wires. This definitely doesn't look original. Any clues what it might've been used for, and more importantly, is it no longer needed, for a car with now-all-original wiring?

 

[BeepBeepRR]

Find out where the violet colored wire goes "last picture" I bet it goes into the driver side kick panel and into the connector that feeds the tail lights. Its either a bypass wire to bypass something that was not working or they needed to use the brake pedal to trigger something.

 

[Bird 426]

The second photo is the harness for the ign switch light. Yellow is a ground circuit? They all get plugged inline on the way to the door switch.

 

[Coelacanth]

Find out where the violet colored wire goes "last picture" I bet it goes into the driver side kick panel and into the connector that feeds the tail lights. Its either a bypass wire to bypass something that was not working or they needed to use the brake pedal to trigger something.

That wire just hangs down and there's a blue tube wire connector on the end of it. I'll need to take a closer look there but I've already reconnected everything with the wiring at the kick panel and didn't see any loose wires.

 

[Coelacanth]

The second photo is the harness for the ign switch light. Yellow is a ground circuit? They all get plugged inline on the way to the door switch.

I didn't notice any empty spades at the wiring at the kick panel, but I'll take a closer look. Seems odd that yellow would be a ground...

 

[Coelacanth]

Thanks again guys, I'm just a bit cautious about connecting the battery until I've figured out as much of the wiring as possible.

 

[Vaanth]

I have my instrument panel out, it's fixed and cleaned up/restored as good as possible. While it was out, I had a good look at the wiring under the dash, and spent a good couple hours following FSM info and a color wiring schematic I had to identify any potential wire issues. There are some obvious connectors with no mates as my car lacks the center speaker, currently has no stereo, there's a connector on the steering column for a cruise control I never had, and probably a connector for A/C, which I never had.

That said, I found a few mysteries that hopefully someone can help me unravel.

My car used to have an alarm system that was long ago removed. I also have removed all the wiring to the stereo and speakers I used to have. But these 3 mysteries have me confused.

This 3-spade connector with parallel-aligned spades has no mate anywhere. Looking at the yellow, yellow w/brown tracer, red and grey (?) wires, does anybody know what this might've been used for?
View attachment 1916710

The three terminal connector is for the key-in buzzer. The following image shows an example of the buzzer:

This single-spade yellow wire hanging off what I believe is the delay-relay, with yellow and pink wires...what might this connect to, if anything?
View attachment 1916711

For the time delay wiring, pink is the power feed, yellow with tracer is the door switch feed(s), and yellow is the feed to the ignition switch lamp. For 1970, there should be a yellow wire with bullet connector going to the column for the column mounted switch lamp. The spade terminal was used in 1969 for the dash mounted switch. It looks like it is connected with the other yellow wire, but if it has a tracer on the other side and is connected with the other yellow with tracer, it is for connecting into the door switch wiring. It does not appear in the 1970 Charger service manual.

And lastly, this purple wire hanging loose from the brake switch, where it was spliced into one of the pink wires. This definitely doesn't look original. Any clues what it might've been used for, and more importantly, is it no longer needed, for a car with now-all-original wiring?
View attachment 1916712

The purple wire is not original and has been spliced into the pink wire. The pink wire is powered all the time, so it was likely added as a full time power tap, perhaps for the removed security system.

 

[Coelacanth]

Awesome Vaanth, thank you. I figured that purple wire might've been for the old alarm system.

I'll have a closer look at my steering column for anything related to the yellow wire, but I have a feeling it's a remnant from a 1969 dash harness and doesn't do anything with the 1970.

As far as the key-in buzzer goes, I might have an update on that later this evening.

 

[MWbirdLOVER70]

1st pic should be for the dash map light that my 70 RR had to and had a map light that I installed last year in my car from pick and pull days. Check FSM and should show it’s a map light

 

[Coelacanth]

The purple wire in the third pic above was indeed a spliced-in wire for the long-gone alarm system. It wasn't even soldered in. Unwrapped the tape, removed the purple wire and re-wrapped with fresh electrical tape. I think I have all of the instrument panel wiring sussed out. Now I need to add electrical Bosch tach and voltmeters..

 

[Coelacanth]

Adding an update to this topic, I have one more wire mystery to solve. Sticking out from the rear of the instrument panel is this grey wire and female single-spade connector. I can find no mate for it anywhere in my wiring. Scouring the FSM and wiring diagrams, my best guess is this is for the clock of the Tic-Toc-Tach as that seems to be the only grey wire referenced in that area of the diagrams, and seems likely considering the location.

What does this connect to? I already have the press-on connector and spade connector connected to the Tic-Toc-Tach so I'm confused what this is for. Incidentally, my tach hasn't worked since day 1.

 

[70gtx440dana]

Should be a matching gray wire on your dash harness. The tach has a separate harness with two wires that is required. One wire (blue) goes to the fuse box. The other wire (gray with black tracer) goes to bulkhead. There should be a hole in firewall about 3/4" dia. near the master cylinder. Then you need the underhood harness to connect to coil.

Wow...someone butchered the center of your dash frame. That's gonna be tough fix.

 

[Coelacanth]

Should be a matching gray wire on your dash harness. The tach has a separate harness with two wires that is required. One wire (blue) goes to the fuse box. The other wire (gray with black tracer) goes to bulkhead. There should be a hole in firewall about 3/4" dia. near the master cylinder. Then you need the underhood harness to connect to coil.

Wow...someone butchered the center of your dash frame. That's gonna be tough fix.

Thanks. I'm the butcher. Back in the 80's, I did a bit of hacksawing to not only install a pull-out stereo (the whole stereo pulled out back in those days, not just the faceplate) but hide it behind a removable section of the black plastic center dash piece. It was pretty cool back then, if I do say so myself. If a thief were to peek into the car, he'd see no stereo at all. I decided to do this after a thief broke into the car and, in trying to remove an earlier pull-out stereo chassis that was empty (the stereo wasn't even in the car), did his own butcher job ripping the chassis out of the dash.

Going forward, the car won't have a stereo and I have a replacement plastic center dash section, it just has some holes drilled, maybe it originally had a choke pull-off or something. I have a plan to use my original butchered piece to cut a donor piece to cover the replacement part's drilled holes. It won't be original but I can be pretty clever when it comes to fabricating things...see my console courtesy light mod for a sample.

Once I have that replacement section installed, I'll just need a woodgrain radio delete plate and only the purists would be offended. I didn't hack out any of the original screw mounting holes.

EDIT: Thanks by the way, I do have the 2 tach wires already connected. I'll see if I can find a gray wire somewhere in back there.

 

[70gtx440dana]

Whoops...hope I didn't offend you. Tons of these cars got aftermarket radios leading to dash mods. Good luck with your improvements.

 

[Coelacanth]

No offence at all. It indeed looks a lot worse than it is. Doesn't help that I have a broken map light switch and I can't justify spending $100-ish for a whole map light unit when I just need a switch...

 

[MWbirdLOVER70]

That gray lead in the pic is the clock power up wire and other wire ( believe female will be close by)

 

[MWbirdLOVER70]

Adding an update to this topic, I have one more wire mystery to solve. Sticking out from the rear of the instrument panel is this grey wire and female single-spade connector. I can find no mate for it anywhere in my wiring. Scouring the FSM and wiring diagrams, my best guess is this is for the clock of the Tic-Toc-Tach as that seems to be the only grey wire referenced in that area of the diagrams, and seems likely considering the location.

What does this connect to? I already have the press-on connector and spade connector connected to the Tic-Toc-Tach so I'm confused what this is for. Incidentally, my tach hasn't worked since day 1.

View attachment 1926604

View attachment 1926605

Coel, that a 71 steering wheel I believe

 

[Coelacanth]

Coel, that a 71 steering wheel I believe

It sure is. I love it, I got it from a local pick-and-pull back in the day. It looks and feels more sporty and the faux woodgrain trim plate seems to match my dash better. The '70 Charger wheel looks and feels like I'm driving a bus. I still have my original wheel in my parts stash.

I found the male connector for the clock lead. I see how I missed it, it's only a 3 or 4-inch short wire sprouting off the thick cable cluster close to the driver side. I spotted a grey wire hanging down almost totally hidden, pulled it up and voila, there was the male connector.