Makes no sense . . . . but see it all the time - Page 2 - Vintage Mustang Forums
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post #16 of 71 (permalink) Old 04-15-2017, 05:31 AM
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Loose or corroded battery cable(s). Quick fix on the side of the road, get a jump, go on your way.


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post #17 of 71 (permalink) Old 04-15-2017, 06:59 AM
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You won't get enough of a charge during the jump to last you 5 minutes. When the reserve capacity of the battery is gone, it need s a good charge. If the charging system is dead, a quick jump isn't going to do it.
Maybe that's why you see it all the time. It's not multiple cars, it's the same one five minutes and two miles later.

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post #18 of 71 (permalink) Old 04-15-2017, 07:27 AM
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Here is a real life one, alternator dies in wife's car on highway. Swap batteries, jump start my car with the good alternator - everybody gets home...

Basically, any situation where a bozo runs the battery dead trying to start a broken car, someone who knows cars fixes it, stuck float for instance. Jump start and on you're on your way.

I would bet however that 3/4 of those jump start scenarios as you say are futile...

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post #19 of 71 (permalink) Old 04-15-2017, 10:34 AM
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Ran out of gas once many years ago and left the car on the side of the road with the hazard lights flashing. Took way too long to get back to the car and when I did, the battery was too weak to start the car. Had to jump it.
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post #20 of 71 (permalink) Old 04-15-2017, 12:03 PM
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Loose or corroded battery cable(s). Quick fix on the side of the road, get a jump, go on your way.
Nope, battery doesn't even need to be connected for the engine to run with an operating charging system.
post #21 of 71 (permalink) Old 04-15-2017, 12:03 PM
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Maybe that's why you see it all the time. It's not multiple cars, it's the same one five minutes and two miles later.
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post #22 of 71 (permalink) Old 04-15-2017, 12:05 PM
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Here is a real life one, alternator dies in wife's car on highway. Swap batteries, jump start my car with the good alternator - everybody gets home...

Basically, any situation where a bozo runs the battery dead trying to start a broken car, someone who knows cars fixes it, stuck float for instance. Jump start and on you're on your way.

I would bet however that 3/4 of those jump start scenarios as you say are futile...
Yep, you can figure out some real scenarios, I just don't give most that room in real life
post #23 of 71 (permalink) Old 04-15-2017, 12:06 PM
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Ran out of gas once many years ago and left the car on the side of the road with the hazard lights flashing. Took way too long to get back to the car and when I did, the battery was too weak to start the car. Had to jump it.
Yep . . but if your battery was in good shape, you left it there a while
post #24 of 71 (permalink) Old 04-15-2017, 02:14 PM
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The one that I see most often is that a battery shorts a couple or more cells internally and this is a dead short. Electronic ignitions including the MSD box in my hot rod do not like weak batteries so they just shut off. Even if you try and jump start the car it won't crank because the defective battery has a dead short inside it which the electronics reads as low voltage. I would guess a lot of people trying to jump start their modern cars don't understand this.

Back in the "old days" before all this electronics arrived inside the car, a car could be cranked on a weakened battery like this if it still had just enough juice to just turn over the engine. This doesn't work any more. Only fix is to get a good battery.


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post #25 of 71 (permalink) Old 04-15-2017, 03:40 PM
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Nope, battery doesn't even need to be connected for the engine to run with an operating charging system.
Not true on a modern FI engine in some cases. If there is a heavy electrical load and the alternator can not keep up, the car may stall.


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post #26 of 71 (permalink) Old 04-15-2017, 06:10 PM
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After depletion of the reserve capacity, a jump will get you a couple minutes at best. These aren't "brainiacs" who know what's going on . . look for the tow truck, it's coming. OH . and if it's night time, you're going nowhere
Funny how you say it can't be done when I've done it. Multiple times. A revved up 3G alternator can juice up a dead battery for folks pretty darn well from my experience. I carry big fat welding lead grade jumper cables. I've gotten more than a few people off the side of the road. A couple of times it was me on the side of the road. I've driven a lot of low quality vehicles over the years.
I once limped a motorcycle home 20 miles that wasn't charging. The last ten miles it was so weak if I touched the brake lights the engine would sputter.
Another different motorcycle quit charging at night miles from home out in the boondocks. I puttered along in the dark with a pocket flashlight but turned on the running lights when a car came along.
A friend and I once hot-swapped batteries in running cars so the one not charging could keep going. Took three swaps to get home. How we didn't blow the charging system on the good car, I don't know but it worked.
To get a trail bike out of the woods we once rigged up a household extension cord and plugged the ailing bike into a second bike. Then both riders stayed side by side and rode back to the trailer. Ruined the extension cord for its original purpose but I kept it in my bike bag for years after. As I recall when we were rigging it up a bystander was there insisting that "That'll NEVER work."
Just because they don't teach this stuff in school doesn't mean it doesn't work out in the field.

My priority is to get folks the heck off the interstate if I can, using whatever tools are at hand. It's very dangerous on the side of the highway. If jumping them off will get their car a couple of miles to an exit I'll try it. Sometimes I drive a tow truck too but I'm only after highway patrol/county/city calls. Wrecks, DUI's, and such.
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.... it wouldn't be the first time reality took theory and conjecture out behind the woodshed and gave them a good thrashing.
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post #27 of 71 (permalink) Old 04-15-2017, 06:17 PM
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I have a VW Rabbit. (Truck) If it's warm you can remove the battery completely and I can still start it and drive away. I will bypass the the fuel cutoff and push start it. Away I go. No brake lights or electrical system of any kind but it will go and stop. So I can see a diesel Rabbit going miles without an alternator. In daytime you'd only really need the battery for brake lights and to keep the fuel solenoid energized. (Hand signals for turns) Rather shorter distances between stops with a gas engine but I can totally see someone doing that. I was once young and did stuff like that too.
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post #28 of 71 (permalink) Old 04-15-2017, 06:24 PM
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Poor folks have poor ways. Calling for a tow is impossible for someone that has no money to spare. You don't have to believe in the scenario to make it true. Like Gypsy said, real life experience proves your opinion wrong. Thankfully I've never been the guy getting the jump but I've sure been the guy doing the jumping. You'll be surprised at how far you can get on a 5-10 minute jump.

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post #29 of 71 (permalink) Old 04-15-2017, 07:09 PM
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Car runs out of gas. Inexperienced driver does not realize it is out of gas, and runs the battery down trying to start it, and the hazards finish it off before DAD (also known as SUPERMAN) shows up, diagnoses problem, puts in a gallon, and then jumps the car enough to get the gas to the injectors and the car starts, and then the alternator kicks in.

Ask me how I know about this in the last 2 months.
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post #30 of 71 (permalink) Old 04-16-2017, 10:18 PM
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