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1973 240z Custom Wiring From Scratch

Matthew Abate

By Matthew Abate
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SteveJ GrandMaster Z

SteveJ

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Posted
39 minutes ago, Matthew Abate said:
  • I have a yellow wire ending in a female bullet connector sharing a sleeve with a black wire ending in a female spade connector
  • That black wire extends to where the yellow wire merges into the harness and has another female spade connector
  • At that same point I have a green w/ white wire and a black w/ white wire, both ending in female spade connectors
  • There is also a longer black w/ white wire ending in a female spade connector and shrouded in a black sleeve

Yellow - connects to the temp sender

Black - goes from the distributor to coil negative

Green/white - from ballast resistor to tachometer

Black/white - from key switch (ignition power) to ballast resistor

Black/white with shroud - from tachometer to coil positive

44 minutes ago, Matthew Abate said:

Further up the harness, about 10 inches from the bundle of wires for the lights on the left side of the car, I have 3 wires that have been cut: black w/ yellow, green, and black. See the far left side of the following image.

Black/yellow & black - washer motor

Green - typically horn

58 minutes ago, Matthew Abate said:

The next mystery is a bundle of 4 wires that emerges between the bundle for the starter and the thick branch of wires that holds the wiper motor connector, among others. There are 2 red w/ black ending in male bullet connectors and 2 black w/ yellow ending in female bullet connectors. See the middle of the image below

Red/black - reverse light switch on transmission

Black/yellow - neutral safety switch for solenoid power

1 hour ago, Matthew Abate said:

Lastly, I have two 4 wires emerging from that thick branch that holds the wiper motor connector and what I think is the seatbelt relay (automatic only). There is a black wire that is on its own and has been cut. There is also a bundle of 3 wires: black ending in a male spade connector, black w/ yellow ending in a female spade connector, and yellow with green ending in a female bullet connector. This bundle of wires is about 6 1/2 feet long, and the diagram does not show any yellow w/ green wires.

The black was probably a ground - maybe the chassis ground?

Black/yellow - solenoid power

Yellow/green - not sure why this would be alone. It could be associated with the intermittent wiper relay. Page BE-2 does show the Y/G wire as a pin on a 3 wire connector. The mystery is that BE-2 shows 2 Y/G wires for the engine harness. One is on the blue connector, and the other is on the white connector. However, I only can find the destination of one Y/G wire at the 3 wire connector.

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Matthew Abate MenZor

Matthew Abate

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Posted (edited)

Thanks @stevej!

Some of this is definitely right, but I have some questions about a few things.

8 hours ago, SteveJ said:

Black/yellow & black - washer motor

Green - typically horn

Is the washer motor not up on the washer tank by the firewall? If it is, I think we both has some stuff swapped around.

I thought maybe these wires went to the Thermo Switch and other things that connected to the distributor on the Automatic cars. Here's a close crop of the illustration in the FSM where this stuff is. It would be between the lights and the ballast resistor, but I don't see a branch in the harness in the illustration.

Front Left Corner.png

I'm pretty sure I have the green wires for the horns accounted for in the bundles coming out of the loom near the headlights. This one is further down the harness toward the coil. I chased it back to a splice where it joins a green wire that goes back to the other end. There are two black w/ white wires in that splice as well. These are the ones that go to the coil and stuff you mentioned.

 

8 hours ago, SteveJ said:

The black was probably a ground - maybe the chassis ground?

There is a black wire running to a ground next to the battery in the wiring diagram. Do you think it's this one? (Why the hell would someone cut that!?!)

Ground.png

 

8 hours ago, SteveJ said:

Yellow/green - not sure why this would be alone. It could be associated with the intermittent wiper relay. Page BE-2 does show the Y/G wire as a pin on a 3 wire connector. The mystery is that BE-2 shows 2 Y/G wires for the engine harness. One is on the blue connector, and the other is on the white connector. However, I only can find the destination of one Y/G wire at the 3 wire connector.

I am wondering if this whole mess actually goes to the washer tank and what I have labeled as the washer tank wire goes somewhere else. Here's where this is in the FSM illustration:

Water Tank.png

It would make sense that this thin branch would be this part given how long it is. However, if it is some of these other things are not what I have them labeled now.

Edited by Matthew Abate
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SteveJ GrandMaster Z

SteveJ

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Okay, so I went down to my car to take a look to see what I could match up. The black/yellow and green wire are for emissions controls. Matching wire lengths helps, even if the controls have been removed.

image.png

The black/yellow is for the opener control valve, and the green is for the solenoid valve. Look through the EC section of the FSM for more info. In my car, a previous owner had cut the wires and spliced them back in. I'm not sure why.

In looking at the washer motor, my car does not have a yellow/green running to the washer motor. I believe it was black/yellow. I could not find a single yellow/green, only the one in the 3 wire connector for the wiper amplifier. Of course, there's only so much time I'll spend contorted in the footwell to look at the wiring. 

As for why someone would cut off a body ground...well, I don't use the term IPO (idiot previous owner) for fun.

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Matthew Abate MenZor

Matthew Abate

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I have another table for you, this time for the engine harness in automatic cars.

For manual cars, you would not have the Seatbelt Relay, the Inhibitor Switch, the Thermo Relay, or the Thermo Switch. In a 1973 car with a manual transmission, you WOULD have the Throttle Opener Vacuum Relay for the flat top carburetors (not included in the table).

Note that there are a few things I was unsure of in here, so they are marked with a pink background in the table cell. The wires that were cut have indeterminant lengths, so I measured how long they were to the point where they were cut. Where the harness I have differs from the FSM and wiring diagrams, I have marked the change in red.

The things I am most curious / worried about are the missing black w/ yellow wire that should be coming out of the blue 10-pin connector and the missing green w/ black wire that should be coming out of the green 10-pin connector.

1973 240z Engine Harness (Automatic Transmission) Inventory
Position Component Connector Color Connector Style Connector Image Direction # of Pins # of Wires Diagram Wire Color Sample Wire Color Min. Feet of Wire Needed
1
Instrument Harness A
Blue
10-Prong
IMG_4750.JPG
F
10
9
Red w/ Black Red w/ Black 6 (to Yellow Splice C)
Red w/ White Red w/ White (Heavy) [See Headlight LH]
Green w/ Black Green w/ Black [See Horn Relay]
Green w/ Red Green w/ Red [See Horn Relay]
– – –
Yellow w/ Green Yellow w/ Green [See Low Brake Fluid/Pressure Sensor]
Red w/ Black Red w/ Black [See Reverse Light Switch on Trans]
Black w/ Yellow – ?
Red Red [See Fog Light RH]
Blue w/ Yellow Blue w/ White [See Wiper Motor]
Instrument Harness B
Green
10-Prong
IMG_4751.JPG
F
10
8
Black Black [See Ground - ?]
Black Black (Heavy) 2 (to Blue Splice A)
Green w/ Black – ?
– – –
– – –
Green w/ Black Green w/ Black [See Parking & T/S & Side Front RH]
Green w/ Red Green w/ Red [See Parking & T/S & Side Front LH]
Blue Black w/ Yellow [See Seat Belt Relay]
Green Green [See Seat Belt Relay]
Green Green [See Seat Belt Relay]
Instrument Harness C
White Black
10-Prong
IMG_4752.JPG
F
10
8
Blue w/ Yellow Blue w/ Yellow [See Wiper Motor]
Red Red (Thick) [See Headlight RH]
Green w/ Blue Green w/ Blue 5 (to Blue Splice F)
Red w/ Blue Red w/ Blue [See Inspection Light]
Red w/ Yellow Red w/ Yellow (Thick) [See Headlight LH]
– – –
– – –
Black Black [See Water Tank]
Blue Blue [See Wiper Motor]
Yellow w/ Green Yellow w/ Green [See Intermittent Relay]
Instrument Harness D
Black White
10-Prong
IMG_4753.JPG
F
10
9
Blue w/ Red Blue w/ Red 2 (to Yellow Splice A)
Yellow w/ Black Yellow w/ Black [See Oil Pressure Switch]
Black w/ White Black w/ White 2 (to Orange Splice A)
Black w/ White Black w/ White 4 (to Blue Splice C)
Yellow w/ White Yellow w/ White [See Temperature Sending Sensor]
– – –
Green Green [See Hazard]
White White [See Hazard]
Black w/ White Black [See Ballast Resistor]
Green w/ White Green w/ White [See Ballast Resistor]
Instrument Harness E White   IMG_4754.JPG   1 1 White w/ Red White w/ Red (Heavy) [See Alternator]
Instrument Harness F White   IMG_4755.JPG   1 1 White White (Heavy) 3 (to Green Splice A)
Horn Relay
Clear Spade
IMG_4756.JPG
F 1 1 Green w/ Black Green w/ Black 2
Clear Spade F 1 1 Green Green 7 (to Yellow Splice D)
Clear Spade F 1 1 Green w/ Red Green w/ Red 2
Intermittent Relay
White
4-Prong
IMG_4757.JPG
F
4
3
Yellow Yellow [See Wiper Motor]
Green Black 4 (to Blue Splice B)
Yellow w/ Green Yellow w/ Green 2
Hazard
White
2-Prong
(90 Degree)
IMG_4758.JPG
F
2
2
White White 2
Green Green 2
 
Yellow Splice A
N/A
N/A
N/A
N/A
2
2
Blue w/ Red
N/A
Red w/ Black
2
Seatbelt Relay (A/T)
White
4-Prong
IMG_4759.JPG
F
6
6
Black w/ Yellow Black w/ Yellow [See Neutral Safety Switch]
Black w/ Yellow Black w/ Yellow 6 (to Yellow Splice C)
Black w/ Yellow Black w/ Yellow [See Inhibitor Switch]
Black Black 1 (to Blue Splice A)
Green Green 3
Green Green 3
Wiper Motor
White
6-Prong
IMG_4760.JPG
F
6
5
Blue w/ White Blue w/ White 4
Blue Blue 4
Blue w/ Yellow Blue w/ Yellow 4
Yellow Yellow 4
Black Black 2 (to Blue Splice A)
Blue w/ Red Blue w/ Red 2 (from Yellow Splice A)
Ground - ?     Missing   1 1   Black 4+ (from Blue Splice A)
Water Tank
Clear Spade
IMG_4761.JPG
F 1 1 Black w/ Yellow Black w/ Yellow 8
Black Spade M 1 1 Black Black 8
Low Brake Fluid/Pressure Sensor Clear Bullet (Large) IMG_4762.JPG F 1 1 Yellow w/ Green Yellow w/ Green 9
 
Yellow Splice B
N/A
N/A
N/A
N/A
2
2
Black w/ Yellow
N/A
Black w/ Yellow
 
Orange Splice A
N/A
N/A
N/A
N/A
2
2
Black w/ White
N/A
Black w/ Yellow
 
Blue Splice A
N/A
N/A
N/A
N/A
3
3
Black
N/A
Black
Black (Heavy) 2 (to Blue Splice B)
3
Reverse Light Switch on Trans
Clear Bullet
IMG_4763.JPG
M 1 1 Red w/ Black Red w/ Black 4
Clear Bullet M 1 1 Red Red w/ Black 3 (from Yellow Splice A)
Neutral Safety Switch
(for solenoid power)
Clear Bullet
IMG_4764.JPG
F 1 1 Black w/ Yellow Black w/ Yellow 5
Clear Bullet F 1 1 Black w/ Yellow Black w/ Yellow 5
 
Blue Splice B
N/A
N/A
N/A
N/A
3
3
Black
N/A
Black (Heavy)
Black (Heavy) 2 (to Blue Splice C)
 
Blue Splice C
N/A
N/A
N/A
N/A
3
3
Black w/ White
N/A
Black w/ White
Green
 
Green Splice A
N/A
N/A
N/A
N/A
2
2
White (Heavy)
N/A
White
4
Starter Motor White 1-Prong IMG_4765.JPG M 1 1 White White (Heavy) 1 (from Green Splice A)
Starter Ground Black Ring IMG_4766.JPG N/A 1 1 Black Black (Heavy) 2 (from Blue Splice B)
Inhibitor Switch (A/T) Clear Spade IMG_4767.JPG F 1 1 Black w/ Yellow Black w/ Yellow 4
 
Blue Splice D
N/A
N/A
N/A
N/A
3
3
Black
N/A
Black (Heavy)
Black (Heavy)
6
Oil Pressure Switch     IMG_4768.JPG   1   Yellow w/ Black Yellow w/ Black 6
Alternator
White
2-Prong
IMG_4769.JPG
F
2
2
White w/ Black White w/ Black 5
Yellow Yellow [See Voltage Regulator]
Black Ring w/ Cap N/A 1 1 White w/ Red White w/ Red (Heavy) 5
Alternator Ground Black Ring IMG_4770.JPG N/A 1 1 Black Black (Heavy) 2 (from Blue Splice B)
7
Voltage Regulator
White
6-Prong
IMG_4771.JPG
F
6
5
Yellow Yellow 2
White White 5
Black Black 5
White w/ Black White w/ Black 5
Black w/ White Black w/ White 5
Distributor Condenser Clear Bullet IMG_4772.JPG F 1 1 Black w/ White Black w/ White 5
5 Inspection Light Clear Bullet IMG_4773.JPG F 1 1 Red w/ Blue Red w/ Blue 7
 
Blue Splice E
N/A
N/A
N/A
N/A
2
2
Black N/A
Black 2 (from Blue Splice D)
 
Yellow Splice C
N/A
N/A
N/A
N/A
2
2
Red w/ Black
N/A
Red w/ Black
 
Blue Splice F
N/A
N/A
N/A
N/A
2
2
Green w/ Blue
N/A
Green w/ Blue
 
Yellow Splice D
N/A
N/A
N/A
N/A
2
2
Green
N/A
Green
 
Orange Splice B
N/A
N/A
N/A
N/A
2
2
Red w/ White (Heavy
N/A
Red w/ Black (Thick)
8
Side Marker Lamp RH
Clear Bullet IMG_4780.JPG F 1 1 Green w/ Blue Green w/ Blue 2 (from Blue Splice F)
Clear Bullet   M 1 1 Black Black 2 (from Blue Splice E)
Parking & T/S & Side Front RH
White
3-Prong
IMG_4776.JPG
F
3
5
Black
Black 6
Black 6
Green w/ Blue
Green w/ Blue 2 (from Blue Splice F)
Green w/ Blue 2 (to Blue Splice G)
Green w/ Black Green w/ Black 6
Head Light RH
White
3-Prong
IMG_4775.JPG
M
3
3
Red Red (Thick) 6
Red w/ Black Red w/ Black 6
Red w/ White Red w/ Black 1 (from Yellow Splice C)
Fog Light RH
Clear Bullet   M 1 1 Black Black 6
Clear
Bullet
IMG_4782.JPG
F
1
2
Red
Red
[See Fog Light LH]
6
Horn RH Clear Spade IMG_4774.JPG F 1 1 Green Green 6
 
Blue Splice G
N/A
N/A
N/A
N/A
2
2
Green w/ Blue
N/A
Green w/ Blue
 
Blue Splice H
N/A
N/A
N/A
N/A
2
2
Black
N/A
Black
9
Horn LH Clear Spade IMG_4783.JPG F 1 1 Green Green 8
Fog Light LH
Clear Bullet
IMG_4784.JPG
M 1 1 Black Black 8
Clear Bullet F 1 1 Red Red 8
Parking & T/S & Side Front LH
White
3-Prong
IMG_4786.JPG
F
3
3
Black Black 8
Green w/ Red Green w/ Red 8
Green w/ Blue Green w/ Blue 1 (from Blue Splice G)
Head Light LH
White
3-Prong
IMG_4787.JPG
M
3
3
Red w/ Yellow Red w/ Yellow 8
Red w/ White Red w/ White (Heavy) 8
Red w/ Black Red w/ Black 3 (to Yellow Splice C)
Side Marker Lamp LH
Clear Bullet
IMG_4785.JPG
F 1 1 Black Black 8
Clear Bullet M 1 1 Green w/ Blue Green w/ Blue 1 (from Blue Splice G)
10
Thermo Switch (A/T) - ?     Missing     1   Black w/ Yellow 7+ (from Yellow Splice B)
Thermo Relay (A/T)
    Missing     1 Black Black 9+
    Missing     1 Green Green 9+
11
Temperature Sending Sensor Clear Bullet IMG_4788.JPG F 1 1 Yellow w/ White Yellow w/ White 13
Distributor Clear Spade IMG_4789.JPG F 1 1 Black Black [See Coil]
Coil Positive Clear Spade
IMG_4790.JPG
F 1 1 Black w/ White (w/ Shroud) Black w/ White (w/ Shroud) 12 (from Orange Splice A)
Coil Negative Clear Spade F 1 1 Black Black 2
Balast Resistor
Clear Spade
IMG_4791.JPG
F 1 1 Green w/ White Green w/ White 12
Clear Spade F 1 1 Black w/ White Black w/ White 12

Edited by Matthew Abate
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Matthew Abate MenZor

Matthew Abate

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Posted (edited)

Thanks! I am hopeful that I didn't make any errors. If I did it would most likely be with the measurements of the wire lengths, since I was super tired of working on this harness by the time I got to that step. I checked them a couple of times, so they should be right, but there are a lot more splices in this harness than there were in the body harness and they are mostly blue or yellow, so difficult to keep straight.

I'm also bothered by the fact that someone cut 4 of the wires and I can't tell you how long they should be or what the connector should be. :/

–––

Also, I was wondering if anyone knows what gauges the OEM wires are. It looks like there are 3, maybe 4 sizes, which I have tried to indicate with (heavy) and (thick) next to the wire colors in the table.

Edited by Matthew Abate
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