Does an accurate wiring diagram exist for early 1970 240Z?

[Mikes Z car]

Hi all,

The FSM for early (1/70) 240Zs doesn't seem to exist and the one for the 1972 model that is available seems to show the wiring to be different from the 1970 model. Is there an accurate wiring diagram for the early 1970 240Z? When I use the search it seems to be able to take only one word and if two are used it seems to use them each separately so that a search on "accurate wiring" turns up posts with either but not both words. Do I have this right?

Thanks,

Mike

Edited September 8, 2009 by Mikes Z car
grammar

[Duffman]

I was sent this from someone who said it was for early Zs, looks pretty accurate to me.

70_240z_wiring[1].pdf

[280~Master]

The FSM for the early 240 does exist just hard to find. There is a reprint copy out there. There is a section with the wiring diagram in it section Body Electrical or BE. The wiring diagram is located on page BE4. sblake01 has links to FSM's for download.

[Arne]

I was sent this from someone who said it was for early Zs, looks pretty accurate to me.

That one is about as good as they get. I looked for a long time for a truly accurate diagram,never found one any better than that. Its pretty much the same as the one in my '71 FSM. It's biggest failing is the complete absence of the heater fan wiring...

[sblake01]

sblake01 has links to FSM's for download.

1972 is the earliest I have a link to as far as an FSM. I also have that same wiring diagram that duffman attached. Edited September 8, 2009 by sblake01

[cbudvet]

I bought one off ebay a few years ago that was laminated and in color too! I can't say how accurate it is because I haven't had time to start on the wiring project. Hopefully this fall. It is labelled for the 69-70 years. They sell another one for the later years.

carl

[Mikes Z car]

Thanks to everyone for the great information. What I am trying to figure out is (see attached drawing for clarification):

1. What color and color stripe are the wire(s) that the heater fan plugs into? (one wire I assume)

2. What color and color stripe are the wires that the console switch plugs into? (two wires I assume)

The PO did some great work on my car but I want to connect the wires more like stock and when I bought the car the blower could be turned on with the key removed and the back glass heater switch had no wires connected to it. Can the back glass heater be turned on with the key removed? Seems I remember on my old 71 240 that it could be and I was always worried about leaving it on.

Thanks for any information,

Mike

Edited September 9, 2009 by Mikes Z car
grammar

[geezer]

The heated glass switch wires are red/black & blue. Are you asking about the blower motor? It has a red 12V & black coming from the blower switch and is also grounded. PM me an email address and I will try to send you a wire diagram. No, with the key in the off position you should not have power going to the heated back window switch or the grid. I don't know from personal early car experience but have heard that the wire colors actually in the cars differs on occasion.

Edited September 9, 2009 by geezer
more info

[Duffman]

You must have replacement hatch glass on your Z (with vertical or horizontal defroster lines), because early Zs had the clear glass without the defrost control. My #1399 has the clear hatch glass, no defrost lines.

[Mike]

I was sent this from someone who said it was for early Zs, looks pretty accurate to me.

I just love how simple the early wiring diagram looks compared to later model cars and (especially) newer cars.

[geezer]

You must have replacement hatch glass on your Z (with vertical or horizontal defroster lines), because early Zs had the clear glass without the defrost control. My #1399 has the clear hatch glass, no defrost lines.

This is correct. There was no provision for wiring a rear defroster before HLS30-01456 in the harness but detailed instructions and a part list were available for retrofitting. The bulletin covering this installation is dated 04/72.

I have a wiring diagram that has the rear defroster grid wiring incorporated into it as well as showing the blower (fan) switch and motor. It is supposedly for the US/Canada early cars but also shows the passing relay circuit as well as A/C wiring addon info. Seems to be a compilation of what was missing on other diagrams and obviously drawn up years after the fact. I don't think the color coding can be relied on. Here is the diagram for the defroster grid in the bulletin.

[Mikes Z car]

Thanks everyone for the great information! I didn't know the first Zs didn't have the heater grid on the glass and that therefore there is no heater switch. I had assumed the car I have now is in the same configuration as the 71 240 I used to have.

(insert loud buzzer here from old TV game show)

No wonder I can't find where the glass heater switch plugs into because in a manner of speaking Nissan hadn't thought of it yet.

Mike