35 minutes ago, Captain Obvious said:

Thanks for the help. I have an incomplete version of the 1970 FSM, but I've been through the EE section. It don't think it shows all the condensers.

For example, the circuit diagram you posted only showed the condenser mounted on the distributor. They didn't include the one on the coil attached to the positive side (crudely grafted onto the the diagram below):

And they didn't show how the tach connects! At least not until 1972, and it was still cryptic then!

You're welcome. This is strange indeed.

The images I posted came from a parts book CD I purchased from Courtesy Nissan about 15 years ago. When I picked up #957 last year it came with a two volume original 1970 FSM set. The body and chassis volume is dated November 1, 1969. Strangely the L20A, L24 engine volume is not dated, but it does show the early version of the EE-71 diagram with only one condenser and no mention of other engine electrical condensers. With #957 I also got one of the 1997 reprints (for the N.A. Vintage Zed program) of a 1970 FSM as a single volume. Even that one shows only the one condenser in the EE section.

Yeah, weird. Another example of the original wiring diagram for the early cars falling short of accurate. The whole reason I started this journey! And I think I'm approaching the end. The mistakes being uncovered up are becoming less severe and less frequent.

I'll have the new rev out soon. Changes to the horn system, some power distribution stuff (grounding scheme), and of course, the condensers.

Here's the latest wiring diagram. I moved the horn relay to the interior side of the firewall. It was previously shown out in the engine compartment, but in reality it's actually located on the left side of the interior near the driver's left knee and the hood release pull. Changed the way the alternator and voltage regulators make connection to ground. And made a couple of minor wire color changes.

And lastly... Thanks to the help from the folks here, it now has condensers.

<V7.0>

_obvious 240Z Wiring Diagram 7.0.pdf

Bruce,

Many thanks for all your hard work on this project.

Jim

Glad to help. Hope you get some good use out of it!

Well actually, that's probably not a good sentiment, since it implies you may develop electrical issues that would warrant needing a wiring diagram. So I hope you do NOT get good use out of it! Hahaha!! 😄 In any event, I'm glad to help!

So @Mike , I tried to delete the old obsolete incorrect previous version of the wiring diagram (version 6.0 on page five of this thread), and the edit privileges will not allow me to do so. I'm assuming there is a time limit on how far back in time one can go to edit something? And that post on Feb 11 has exceeded that time limit?

Can we change that? Or at least, can YOU delete it if you won't allow me to do so?

The car that sold on BAT recently raised an electrical question for me about the ground distribution.

On the car I'm working on, there is no dedicated ground strap going directly from the battery to the firewall, but instead, grounding to the harness (and hence the body) is done through the alternator. Then I saw that car on BAT, and there IS a dedicated connection right from the battery terminal to the firewall.

Is this connection supposed to be here on the early cars? It's not "necessary" to work, but just wondering if this is how it's supposed to be:

Edited 12 hours ago12 hr by Captain Obvious

It is there for both of my cars - 12/70 and 6/71.

12 minutes ago, Captain Obvious said:

The car that sold on BAT recently raised an electrical question for me about the ground distribution.

On the car I'm working on, there is no dedicated ground strap going directly from the battery to the firewall, but instead, grounding to the harness (and hence the body) is done through the alternator. Then I saw that car on BAT, and there IS a dedicated connection right from the battery terminal to the firewall.

Is this connection supposed to be here on the early cars? It's not "necessary" to work, but just wondering if this is how it's supposed to be:

I'm not sure of the location on the 70/71. I think for 72, the body ground moved to frame rail. I'm pretty sure it's on the frame rail for the 73.

2 hours ago, Captain Obvious said:

The car that sold on BAT recently raised an electrical question for me about the ground distribution.

On the car I'm working on, there is no dedicated ground strap going directly from the battery to the firewall, but instead, grounding to the harness (and hence the body) is done through the alternator. Then I saw that car on BAT, and there IS a dedicated connection right from the battery terminal to the firewall.

Is this connection supposed to be here on the early cars? It's not "necessary" to work, but just wondering if this is how it's supposed to be:

On my 7/70 #6521, it is there like your picture. But on my Jan '70, #957, the tapped hole in the firewall does not exist and that ground wire is attached to the battery hold down frame mounting screw.

Hmmm, After looking at some early cars on BaT I think my car had some work done in that area and the hole got filled in? Here are a couple of images and links to BaT:

#00391

And #00512

https://bringatrailer.com/listing/1970-datsun-240z-38/

Edited 8 hours ago8 hr by CanTechZ