How to start an automatic car with dead battery?

[Pyree]

Like the title says, "How to start an automatic car with dead battery?"

More specificity, if I don't have another battery or power supply to swap, charge or jump start the car for me, can I start the car mechanically? I read those article on how to roll it down the hill, push it or use a rope to spin the wheel, but they all involve the clutch, so that means it is for manual cars only?

 

[wip99gt]

Virtually any non ecm car can run with no battery. As long as alternator output is more than demand then there should be no problem. I've run drag cars with no battery and sprint cars have no battery or even a starter. I wouldn't run a new vehicle with no battery as it's also a filter for voltage spikes/droops from the alternator. Even so it most likely still be able to run without one, I just would be paranoid about the electronics. I know I can run ECM controlled diesels with no battery just fine.

 

[Christheenginedude79]

Even in a perfect world a cordless power drill in no way could remotely provide enough Ah ( amperes hour ) to sufficiently deep charge a car battery regardless on how the power is being transferred. If you were able to get past the alternator activating issues and were creating enough voltage and few amps of output to the battery then the power drill would have to be charged countless times before the battery were capable of deep cycling to turn the engine over. In short, how many power drill batteries does it take to equal the same power of a fully charged car battery?? Excluding power loss from the alternator's rectifier system and converting electricity to mechanical energy and back to electricity. It is possible to do make it happen but if their is access to a power outlet to charge a drill battery then it probably wise to just buy a car battery charger. I love forums such as this, I enjoy reading over the Ideas people have!

 

[wip99gt]

Yeah I just thought that since I had an engine sitting in front of me at the time I thought what the heck and tried it. All it took was a socket and adapter on my dewalt. It was obviously with the belt off. It did produce power though, although not a high enough voltage and there was no load on the alternator. It's always fun to try new things.

 

[john440]

if you remove the belt and take a chainsaw part take the bar off you can put another belt around the chainsaw I need to spend your alternator

 

[Davester]

Simple...connect two fully charged batteries dewalt 18 volt...connect positive and negative on the battery dewalt...wire both batteries to the dead battery...wait 10 secs and crank it...it will start...

 

[GerryK]

If its a automatic and you have a friend that can tow you place car in Neutral tow car up to 20mph. with ignition on place car into drive.
the speed should be enough to lockup the fluid in the converter and thus turning over motor.
As a retired GM mechanic I too thought that it wouldn't work till a old guy showed me years ago.