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Old 05-29-2012, 06:31 AM   #1 (permalink)
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Default Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

Right, my battery light was staying on so I tested my battery with a voltmeter - turns out when the car is started, the voltage doesn't increase so it's pointing at the alternator. (battery giving me 11.9v off, 11.7v engine on with a few things turned on)

Now my local specialist is about 8 miles away in town driving. (About 20 - 25mins) Do you think I can make it this distance without the car dying? I was thinking of a quick morning run, no radio, no heater, lights etc.

What are my chances?

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Old 05-29-2012, 07:06 AM   #2 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

You're screwed. Don't do it, unless you like pushing dead cars around.
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Old 05-29-2012, 07:07 AM   #3 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

i agree...i don't think you'll get very far
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Old 05-29-2012, 07:10 AM   #4 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

I`ve done it before for a sidejobs car. I struggled to make it from my house to the garage, which is only a 7 minute drive. I`d recommend you don't do it, but if you have to do it, go at night or early morning when its not busy, and have someone follow behind you. Dont use any electronics, lights, anything to save that little extra bit of juice.
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Old 05-29-2012, 07:14 AM   #5 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

I think you should risk it, real men would!
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Old 05-29-2012, 07:48 AM   #6 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

I did 3 short ~10 minute drives (to pick up a booster pack, then a used alternator then back home) with a dead alternator on my NB. Slowly watch the volt meter go down n down but I did make it home. I had a booster pack in the trunk just in case so I wasn't worried.
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Old 05-29-2012, 07:56 AM   #7 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

With the tiny size of out batteries you wont make it far.
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Old 05-29-2012, 08:14 AM   #8 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

mine lasted 15 min after the belt broke
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Old 05-29-2012, 08:17 AM   #9 (permalink)
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Look at the reserve capacity on your battery, that specification is there to tell you how long it will pawed your car without being charged
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Old 05-29-2012, 08:27 AM   #10 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

battery should be 12.6v when off; six cells at 2.1v each. 6 x 2.1v = 12.6v


it's already drained and i doubt youll make the 8 mile trip. The ECU and components will shut off at around ~9v. Find a new alt at a local store, and replace it yourself, stupid easy job.
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Old 05-29-2012, 08:35 AM   #11 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

i have personally had a dead alternator and manage to drive around like for 6-8 hours but i also had a brand new duralast gold battery
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Old 05-29-2012, 08:59 AM   #12 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

quick google search seems to say youre fine for at least an hour or two.
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Old 05-30-2012, 05:52 AM   #13 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

No problem guys. Don't think I'll risk it, don't wanna be stuck in traffic with a dead car. I'll take it to a more local mechanic down the road.
Thanks for the advice.
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Old 05-30-2012, 07:27 AM   #14 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

I think you'll be able to do it but keep in mind that it will put a stain on your battery. Unless your battery is fairly new I wouldn't do it.

-Jason
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Old 06-02-2012, 11:24 PM   #15 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

The talon lasted 15 minutes between charges when trying to get the car home with a dead alt. Just remember a dead alt can cause a battery to die and just the opposite.
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Old 06-02-2012, 11:41 PM   #16 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

I drove over 60 miles in a car with a bad alternator. My friend followed me in another car and we swapped the batteries every time my car stalled. It took a long long time.
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Old 06-05-2012, 02:56 PM   #17 (permalink)
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Default Re: Alternator Dead - How Long Will Battery Last On Drive To Mechanics?

Considering any time you use your brakes the battery will loose more power, I'd suggest towing it there.
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