Another wiring newbie question

Ideally you want no splices? There are several different varieties of wiring diagrams. My 71 doesn't match perfectly any of them. The pink wire is the wire to the coil. The relays are below the dash in the passenger foot well. There should be a perforated metal cover over them.

Thanks for your help. I'm just having trouble indentifying things on the diagram, I'll get better.
I had seen that cage thing, but had not dropped it yet, that makes sense.

Wire going to the coil makes sense as the PO put in another coil and based on what I've seen so far, likely ran a new wire.
As far as splices...all I meant was I believe that it would be better to have one length of wire than 2-3inch pieces added on all over the place. Looks better for sure.

oh, and the pink wire again...there are 2 that I see, a smaller gauge one that goes to the terminal block at the steering wheel, and a thicker gauge one that goes to the molex where the connections for the horn and turnsignals are. I'm talking about the one that goes to the molex.

Thank you!

quote:

oh, and the pink wire again...there are 2 that I see, a smaller gauge one that goes to the terminal block at the steering wheel, and a thicker gauge one that goes to the molex where the connections for the horn and turnsignals are. I'm talking about the one that goes to the molex.

There is a pink/black wire that feeds the turn signal switch. It comes from the load terminal of the turn signal flasher.

John

Thanks John. I'll check it and perhaps take a photo. It isn't hooked up, which is the curious part.

My other pink wire is burned to a crisp, which is what started this whole adventure.

So, I guess I'm color blind. I'm attaching a photo. Something in the connector is wrong since it appears the floating wire belongs in it. You'll see two cut wires coming out of the connector. Those are the ones that run under the hood straight to the battery and horn. The appropriate black and brown wires are cut off in that group of wires.

So, where does the floating wire go and what does it do? It seems like I have an extra wire somehow.

Thanks

That is the elusive violet wire that does not connect to anything. I believe that on the very, very early cars (probably Euro PB cars) that that wire may have fed the turn signals, or at least the early wiring diagram shows that.

On your car, that is an extra wire that should be capped off. There should be a pink/black wire in that bundle, but I can't see it in your pic, possibly because it is behind the other wires.

Do your turn signals work?

As you have discovered, the brown and the black wires are for the horn.

The white wire feeds the headlights via the dimmer switch. Green/black goes to fuses 1 & 2 for the high beams, and the gray goes to fuses 5 & 6 for the low beams.

There should be a pink/black wire that feeds the turn signals via the turn signal switch. The light blue and the light blue/black feed fuses 3 & 4 for the parking lights.

As an added bit of info, unless someone has rewired it, the backup lights are fed from fuse #3, which means that you will have to have the parking or head lights on in order for the backup lights to work (with the shifter in the reverse position). This can easily be changed, if desired.

John

I do see a pink/black wire on the left. It probably enters the connector behind the green/black wire.

John

Oh my God, thank you. I was racking my brain because the horn wires sure looked like they were supposed to be where they are. I'm not sure why the horn was wired the way it is..there is only a single horn up front and the drawings show there were two. Regardless, I want to get it back into the fuse panel with a relay instead of straight to the battery.

I've never really tackled something like this, so this is all new. I've always been more of a bolt on guy. The listserv is great, but I just don't have the time to keep up with the traffic over there. I prefer forums.

Again, thanks so much John!

The horn originally had a relay that was mounted in the relay cluster located above the passenger's foot well. The horn switch (turn signal stalk) energized the horn relay's coil, so it was low current.

Below is a pic of a '71 relay cluster. The '72 is slightly different, as it does not have the radiator fan relays, and it has one more A/C relay.

John

Excellent. Maybe the original relay went bad? Just can't figure out why he cut the original wires. Since he cut everything at the column, I expect I'm going to find everything hooked up at the fuse panel. Maybe I can run some long test cable to the relay and energize just the horn. I need to look back at the drawing. It seemed like it showed the horns grounded in the front, with a single wire running back to the relay.

Quite the adventure, but it will be satisfying when I get it back together.

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I need to look back at the drawing. It seemed like it showed the horns grounded in the front, with a single wire running back to the relay.

Correct. The red wire is the +12v to the relay contacts AND to the relay's coil. The connection to the coil is done inside the relay cover. This red wire should be fed from fuse #7, and it is unswitched. Check for voltage from the red wire to ground. That same red wire also feeds the contacts for the A/C relay(s)

The brown wire completes the relay's coil circuit to ground. With a jumper wire, try grounding the horn relay's "G" terminal (it has the brown wire attached to it). If the horn doesn't sound, listen for a click from the relay, which will at least indicate that the relay's coil is working.

If that works, try grounding the brown wire where it was cut at the nylon (molex type) connector to see if you get the same results.

John

Thanks! Since pretty much all my fuses are blown at the moment...
But, I believe I follow what you're saying. I'll run new wire for black and brown back to fuse panel, and a new red to the horn. Seems like what I need to do to put it back stock.

Kermit

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But, I believe I follow what you're saying. I'll run new wire for black and brown back to fuse panel, and a new red to the horn. Seems like what I need to do to put it back stock.

No, the black and brown do not go to the fuse panel. The brown goes to the relay "G" terminal, and the black goes to ground via the wire harness.

The red on the horn relay "B" terminal connects to the fuse panel at fuse #7.

The white wire on the horn relay "T" terminal goes to the horn(s).

That is the original configuration.

John

Ok. Interesting. All I found underhood was a cut up black wire, didn't see traces of a white wire. Hopefully some of it is still left down at the relay so I can see at least some of how it was routed.

Hang in there. When our horn stopped working decades ago and I needed it functioning for a Concours, I started tracing stuff with a VOM. Eventually I found a power wire goes to the horn and the horn button on the steering column stalk is a grounding button. But these were Italians and they didn't necessarily think like you or I.... the ground wire meanders up from the horns in the right front fender into the main loom, thru a few multiconnectors, threads past the turn signal switch wiring and terminates INSIDE the hollow horn-button stalk. It's soldered from the inside to a hole thru one side of the steel stalk. A slight paint bulge on one side of the stalk is the solder patch. Predictably, it had cracked; removing the paint & reheating the OEM solder patch restored the horns. 2 days of VOM-work but still easier/neater than running 10 feet of new wire.

I think the horns are the only component up front that does actually ground to the body. Everything else however, (radiator fans, radiator t-stats, headlights and markers) ultimately grounds back through one wire to the infamous stud behind the tach.

quote:

I think the horns are the only component up front that does actually ground to the body.

Correct. The horns ground to the body.

John

Well, there is no relay there. The wires are hanging there. Don't know where the white wire is cut. I see it in the connector, but until I cut open the harness, I won't know.

Side note, no fluid in the clutch master, leak somewhere. Hole in about the center of the front, about three inches maybe.

Oh we'll, time to start building a wire order.

Figured I'd just add on to my own thread. As I pull apart the wiring harness, I'm wondering what this is I'm cutting into. It doesn't seem like electrical tape holding the wires in a bundle. What have you guys used to replace this tape-like substance? Heck, maybe it is tape, its 40 some years old...

And a follow on...
The first wire I'm chasing is the pink wire from the ignition to the coil. On my car this wire gets wrapped up in a bundle and goes through the rocker. I'm not pulling all of that out. So I see two options - attempt to feed single wire through rocker or, go through center of car. What would you do? What have you done?

Thanks a lot!
Kermit