Gremlins in my Fairlady's Ignition System

[Zed Head]

I disconnected the blue wire from the Transistor Ignition Unit and tested for voltage with key off and on. At off I get 12v to it from the battery as suggested is correct. With the ignition on, wire still disconnected from TIU I get no power.

I AM NOT TALKING ABOUT MEASUREMENTS UNDER THE HOOD.

I am doing these measurements at the blue wire at the TIU.

I repeat, my wiring setup is OEM Stock and have confirmed it is correct tracing the wires.

This is NOT at the ballast, coil, etc. UNDER THE PASSENGER KICK PANEL with the TIU.

Well, another perspective might help. I'll bail out. The capital letters show some aggravation.

In parting though, I feel compelled to point out that, at the least, the first statement above with a measurement is incorrect. There should not be power to the blue wire at the TIU with the key off. That's not right, and might be a sign. I know this is correct, but went out and measured my coil negative now just to be more than sure. Good luck with it.

"At off I get 12v to it from the battery as suggested is correct."

[dasmoover]

Well, another perspective might help. I'll bail out. The capital letters show some aggravation.

In parting though, I feel compelled to point out that, at the least, the first statement above with a measurement is incorrect. There should not be power to the blue wire at the TIU with the key off. That's not right, and might be a sign. I know this is correct, but went out and measured my coil negative now just to be more than sure. Good luck with it.

"At off I get 12v to it from the battery as suggested is correct."

Not aggravated just trying to be as concise as possible. I appreciate all your input, truly.

Hopefully someone else has some valuable knowledge on the TIU wiring.

Thanks again.

[Zed Head]

Alright, no problems. If your problem were mine, I would make measurements along each point of the ignition circuit with the key On.

What you should see:

Coil positive - battery voltage

Coil negative - battery voltage

Ballast connection from coil negative - battery voltage

End of blue wire from ballast connection - battery voltage.

As I said, that's why I asked about coil positive. It's a key measurement. If you have power to coil positive with the key Off and none with it On, that's a big clue. Best time to do it is now, with the module disconnected. If you get bad measurements with no module in the circuit, it's not the module.