Help needed: 75 1.8 won't start with key;, Will start when push-started Options

[PBC914]

I have a 75 1.8 that won't start. It was running and starting fine. I went for a short trip and came back to the car and it wouldn't start. The starter did not run.
Nothing has been changed in the wiring.

Car will start when push-started.
Ground strap is attached.
Test light glows when attached wires are tested at the starter.
Tried a new starter didn't make a difference.
Fuses look good.

Any ideas would be helpful! Thanks.
Paul

[PBC914]

Thanks for the reply-the seatbelt interlock has not been touched.
I will check the yellow wire at the relay board.

Anything else this could be?

[r_towle]

Thanks for the reply-the seatbelt interlock has not been touched.
I will check the yellow wire at the relay board.

Anything else this could be?

Seat belt logic circuit was a 74 only thing, but you may have one.
It started early in the year, and ended late from what I have seen.

See if you have what looks like a relay under the passenger seat, if so, remove and jumper the two large yellow wires together.

If not,
Check with a helper to see if you have power at the starter (yellow wire spade bit) when you crank the motor.
If not, start by cleaning the positive terminal at the battery, all the small RED wires.
They get corroded enough to make this happen.

If you still get no power at the starter when the key is turned to start, its the ignition switch most likely.

Its a pretty simple circuit.
Red line feeds the ignition switch from the battery...
Yellow feeds the starter solenoid.



rich