Datsun starts but only runs when key is in a certain spot

[70datsun]

Hi. I was looking for help on ignition issues on my 1970 Datsun 311. I bypassed the Ballast resistor but it didnt help.Thank you

Edited May 29, 2019 by 70datsun

[240260280]

On a Z, usually the Ignition Switch in steering column needs replacement. It is easy and inexpensive fix.

Edited May 29, 2019 by 240260280

[70datsun]

I have a new ignition switch. I was able to hotwire to start and run but that no longer works. Im not getting ignition power, only power to the starter. 

[Captain Obvious]

I don't have any technical input at this time, but...

@Mike, Why is this thread in the technical articles section and "promoted to the knowledge base" category? Did I miss some fantastic technical solution above or something?

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Datsun starts but only runs when key is in a certain spot

[jonbill]

Does it fire when you're cranking the starter but stops firing when the key returns to on?

[Mike]

5 hours ago, Captain Obvious said:

 

@Mike, Why is this thread in the technical articles section and "promoted to the knowledge base" category? Did I miss some fantastic technical solution above or something?

Thanks for letting me know.  I moved it to the Electrical forum.

[SteveJ]

To eliminate random guesses, please answer the following to help give us some background.

1. When did the problem start?
a. Just recently
b. A while back, but I finally decided to take care of it
c. Before I owned the car

2. If you selected a or b in question 1, describe how the problem started
a. Gradually - It would start and run sometimes
b. All of the sudden - I was driving along and it just quit. It worked fine yesterday, and then it didn't run today.
c. After I tried to repair/modify something - Be honest about what you touched.

3. What parts have you replaced so far and why?
a. I had problems with that part in the past.
b. A friend suggested it.
c. I read it about replacing this part via an internet post (provide URL)
d. Okay, I'm just throwing parts at the problem (Be honest, most of us have done that at some time.)

4. Why did you bypass the ballast resistor?
a. I checked resistance across the terminals, and I got this reading (provide reading)
b. I read it about bypassing it via an internet post (provide URL) 

5. Please tell us how you hotwired the car.

6. What ignition system do you have on the car?
a. It's completely stock with points.
b. It has a ZX distributor.
c. It has a Pertronix ignitor.
d. It has a Crane (specify model).
e. I have no idea.

7. Describe in detail what happens when
a. You turn the key to start
b. When the key goes from start to on

8. How did you arrive at the conclusion that it is an ignition problem
a. I know it has fuel because...
b. I know the timing is right because...
c. I did the following tests on the ignition...