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Without the battery hooked up, the current draw is too much for the alternator to keep fire on the plugs.

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Q: Your 77 280z will run without the battery connected but quits the moment you turn on the headlights?
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Why would your engine stutter when turning on the headlights?

Weak alternator. Have the charging system checked. I had a 95 Toyota tercel that totally shut down when the headlights turned on and the cause was for the most part dirty battery connections, when the electrical load was raised the alternator could not immediately keep up and required a moment to adjust, but with a bad battery connection (probably the Positive in my case) it couldn't temporarily draw enough power from the battery to still fire the spark plugs hence the immediate stall.


How do you find a short in the headlight wiring that would cause your engine to die when you turn on your headlights?

I believe if you have a short you should blow a fuse. But if your engine is dying you probably have a bad alternator and/or battery. make sure body ground to motor is still connected. This happened to me in a 95 Toyota tercel and the cause was for the most part dirty battery connections, when the electrical load was raised the alternator could not immediately keep up and required a moment to adjust, but with a bad battery connection (probably the Positive in my case) it couldn't temporarily draw enough power from the battery to still fire the spark plugs hence the immediate stall.


When you turn headlights on the engine stalls?

This happened to me in a 95 Toyota tercel and the cause was for the most part dirty battery connections, when the electrical load was raised the alternator could not immediately keep up and required a moment to adjust, but with a bad battery connection (probably the Positive in my case) it couldn't temporarily draw enough power from the battery to still fire the spark plugs hence the immediate stall.


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