Interesting issue, When tach is hooked up car won't turn off Options

[oildrips]

Lots of progress today/tonight. All vacuum lines rerun, dwell/timing set, new oilnpressure switch, oil changed, and I've isolated the issue where the car won't turn off when the key is removed, but there's some funky stuff happening.

So, before I started working on stuff, the car would start, and the engine would continue to run without the key. You'd have to stall it to shut it off. Once off, it would maintain power to the gauges (the generator light stayed lit), so you'd have to undo the battery. to reset everything.

I traced everything back to the tach. Without the tach signal wire hooked up, the key works fine. Engine starts/stops with the key.

Now, after doing all the work. I started the car, and decided to try the tach. Hooked it up, and sure enough the key didn't work to shut it off. I pulled the positive cable off the battery, and the car kept running on its own. I had to pull the coil leads to kill the engine.

Thoughts?

[oildrips]

Mission accomplished. So, the PO added an extra wire from the coil power to the relay board power that kept the relay board powered up. With the relay board powered up, it didn't matter whether or not the key was on (the wire on the relay board is connected to the ECU and fuel pump, so the key didn't affect it at all).

The relay is triggered by the switched coil wire, and now everything works, including the tach (IMG:style_emoticons/default/smile.gif)

Super successful weekend.
Electrical issue resolved
Oil changed
Points/condenser replaced
Timing/Dwell set
Idle speed set
Interior panels recovered and installed
Dash vents/pad reinstalled
Wheels/tires swapped over
Broken fog lamps removed (need a new bolt to put the replacement in)

Now all I have to do is drive it.

[theleschyouknow]

Mission accomplished. So, the PO added an extra wire from the coil power to the relay board power that kept the relay board powered up. With the relay board powered up, it didn't matter whether or not the key was on (the wire on the relay board is connected to the ECU and fuel pump, so the key didn't affect it at all).

The relay is triggered by the switched coil wire, and now everything works, including the tach (IMG:style_emoticons/default/smile.gif)

Super successful weekend.
Electrical issue resolved
Oil changed
Points/condenser replaced
Timing/Dwell set
Idle speed set
Interior panels recovered and installed
Dash vents/pad reinstalled
Wheels/tires swapped over
Broken fog lamps removed (need a new bolt to put the replacement in)

Now all I have to do is drive it.

(IMG:style_emoticons/default/smilie_pokal.gif)
way to go! now go drive it!