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Your results don't surprise me. In fact, it supports what I said in my previous post. You have a problem in the circuit that is restricting current flow between the battery and the turn signal switch. It won't show up as a problem using a voltmeter because the voltmeter is a high resistance device that doesn't require much current. The restriction shows up as a loss of voltage when the circuit is complete. It's late for me. I should have a chance to give you some more diagnostics tomorrow. Maybe I can even make a demo video to illustrate my point.

At the Atlanta Z-CON, Charles and I talked with Matsuo-San when that question came up. As I recall he said that joint was intended to flex. The consequence of a stiff C-pillar was the A-pillar flexing instead with the possibility of a windshield popping out. @Patcon What do you remember of this conversation?

That rust hole in your pic of the D/S roof is just above where the roof panel and the C pillar were joined, it was soldered together with lead. Some have said over the years that it was done that way to allow some flex in that join, others have said that it was just the technology of the day, they both sound plausible to me. It is a complicated joint and difficult to open up to remove the rust. I had one of my Z's dipped because of the same kind of rust and all the leaded joints came back empty. The place I used baked the car in and oven at 600-800F to burn off all the coatings before it went into the acid tank. I'm still looking for the photos of that car when it came back, I'll keep hunting for them. Dipping has some definite advantages but the place I used didn't neutralize the metal very well and I was fighting flash rusting for weeks before I could get get primer on it.

The reason I brought this up was to allow Gav240z to possibly leave a additional response to the classiczcar thread on engine casting dates, that on his last post there, and I believe in the thread …… left his question/puzzle …. On the BAT thread from 2013 or so he came back and made statement on that comment section that for the most part said that it is very possible there is nothing wrong about how 2039 was stamped. Gav240z, Please don’t take my “tone” as agitated, or angry, we own separated twins…..well, sorta. I googled 240z vin 51 and HS30 51 popped up…. Incredibly interesting to me that 2 same vin cars know of each other, and are identical from the factory. Zedhead, Owning a 1969 z has been a quest of sorts for many years, good timing and fortune found one for me. I’m turning over rocks and shaking trees hoping to find more answers and history for this car….. Sorry for being so scattered about progress with car…. It’s my personality….

I "@ ed" Gav240z so that he might give the answer to his own puzzle. Most of what I saw in that nine year old BAT sales post you linked was about definitons of title and ownership and opinions from past Z car people like Tony D (before the D appeared), who is known to enjoy stirring things up. Questions about why the engine and tag were separated from the body and other conspiracy-like things. If you're planning on reselling after you restore you might consider pulling all of the real facts together in an understandable story, with images saved in additon to links, before they get lost to dead web sites and disappearing documents. The people that actually know things about the car will be passing on too, eventually. Time...

Thanks very much. I'm looking forward to re-doing some of our favorite drives when it's finished.

Quick Sunday post to hopefully legitimize and state with pictures of “matching numbers” or as I would say “all original 240z”…… Vin..00051 October 69 car Block L-24 2239 Engine casting # 9828B Deciphered as block born on date of August 28th 1969. Which is in line with what to be expected. I mention this because of some discussion over the years, on BAT, and on this site about this car being a legit matching numbers car. I can understand the concern and the reasons for the discussion. Posting this combination of pictures to hopefully dispel any conflicting thoughts…zz I do welcome any thoughts about this car in anyway shape or form.

Sorry to hear this @CanTechZ and best of luck with the restoration. It will be a very nice memorial when you're done.

So now it's time to look upstream. I suspect you have some corrosion, poor connection, or a loose connection somewhere in the circuit. That improper current path is a choke point, and you see the voltage drop to nothing. You could try some things like jumpering out the brake switch and see if you have brake lights. Also measure the voltage to ground at the fuse for the brake circuit before and after connecting the turn signal switch.

Take some clear photos of the 6-pin connector on your turn signal switch so that we can see the wire colors. Also, when you plug the two halves of the connector together, look for movement in any of the wires. You might be pushing a wire out. If you had a good ground, you should have seen battery voltage to ground at the green/yellow wire.

Post #9 for anybody in a hurry...

Lot's of pictures of this car here on this post from 2016. Upper link directly goes to this car. Also lots of good pics of other early cars, thanks @240260280z aka hoover.

Found an obscure reference to 51 but the links are dead. Post #8 and 9.

Didn't @Gav240z own this car?

Not more details about the plan - more details about the car. Why do you call it a 69? I see a transmission but it's not an early 240Z transmission. The diff is intact but the propeller shaft is not there. What's up with that? The plan will be a lot more interesting with details about the potential of the car. Do you have the missing stuff or did you buy a shell?

More details on the car please

And it is much appreciated, Kats. Your presence and participation on classiczcars has been invaluable and a vital conduit to helping us understand the cars themselves, the history behind them and the people who created them. You are one of their best ambassadors. Thank you. It goes over a lot of heads but I've believe that, to properly appreciate and understand any single one of our cars, it is necessary to understand its siblings; the cars which were conceived, designed, engineered and produced alongside it. I own both RHD and LHD versions. Japanese market, UK market and USA market S30-series Z variants. Taking each one of them completely apart and going through the process of reassembly is both fascinating and educational. It is possible to observe the great efforts the designers and engineers went to in ensuring that each variant worked well whilst accommodating the other variants in their contemporary family. Look closely and you can see details that were incorporated in the fabric of the cars in order to cater for one particular market or one particular variant, hiding in plain sight. A good example being the preparation for factory air conditioning that was present on all models whilst it was only available in one of them. Most owners don't notice... Kats, we have discussed in the past how ownership of both Domestic and Export variants has helped both of us to understand and appreciate the cars more fully, right? It would be great if more owners and enthusiasts could share that experience or, if not, at least take note of the possibilities it offers.

Japanese People don’t care about cars which were sold outside of Japan. My US 240Z has never been invented to Nostalgic Hero magazine. I know some people still think it is a fake of S30. The average sales price is backing up what I am saying. A Fairlady-Z 2/2 is now pricing double or triple of an US 240Z. Am I sad looking at those things? Maybe. But anyway I have my beautiful US 240Z which makes me so proud. People living in overseas don’t care about Japanese Fairlady Z cars. I have seen a lot of people don’t like G-nose because simply it looks ugly to them. Also people don’t like 2- liters cars, Z432 is not an exception. People don’t need information because they don’t use it for their cars. That is why I am here, and my friends here. I want people to know whole range of our cars. I believe looking into various types of our cars make us fun to enjoy better. Kats