No Start after leaving key in on position for 30 min
 

I was working on my power window regulator and left the key in the on position for maybe 30 minutes. Now the car will not start. It just turns over. I swapped the red relay for another (good one). That didn't help.

Is it possible to burn something out by leaving the key on?

Car is a 1981 911SC. All stock CIS.

Thanks!

Can you hear your fuel pump running when in the on position without turning it over?

Battery drained below minimum voltage. Jumper it or push start and drive her around for an hour

Check voltage I bet it is below 12.5

Put it on the charger and walk away. Don't get spooked.

Yep you drained the battery. :).

It's not a dead battery lads.

"1981 SC"... Check the fuel pump relay. I'd bet you bumped it when you were working on the electrics at the fuse box for your power windows. (Reiver is on the right track)

OP states it turns over- if starter turns, the battery can't be drained down too much.

Pull the relay and crank it over several times then reinstall the relay and it should start right up.

That didn't work. What would be the point of pulling the relay?

It's not a dead battery. Battery was 12.2v. Car turns over fine. I gave it a little charge anyway which didn't change anything.

I was working in the passenger side door. The window regulator and motor now work perfectly.

So, is there anything common that can burn out by leaving the car in the on position. If no, I will start basic troubleshooting (fuel, spark, etc).

Thanks

Did you smell fuel when cranking?

If not, then pump may be out.

Also, 12.2v is not good enough, try charging for a little more or jump it.

Spark.
 

I don't think It's the coil, but, check for spark by
pulling #1 & grounding to the engine.

How old is the battery?

Also, check the battery voltage while cranking the engine.

Gerry

Chances are you burned up your coil.

Burned coil, stuck/burned points, bad CDI.

You need a minimum of 12.5, once you know your battery is ok, proceed to other items if it still won't start.

I ruled out the battery. I did put the charger on the battery last night and topped it up. It still doesn't start.

Can you hear the fuel pump running?
If it has points, put a new set in.
Are you getting spark?

'81, no points.
Green wire to dizzy in good shape?
Get your battery voltage up first as others have said.

OP, any unburnt fuel out of tail pipe?

A little different look at this, but do your interior lights work when you open the door? I ask because you were working inside the door and the CIS lambda oxygen sensor/fuel frequency valve system operate on the same circuit as the interior door lights/door switches in the inner door sill. A non functioning lambda system will make car hard or fail to start. Maybe you accidentally disconnected or shorted the interior light switch and need to just check your fuses? Good luck, Tim

Is the cis/lamda the box under the passenger seat?

Battery is good. I hear the fuel pump run.

Unfortunately I haven't had more time to work on it today.