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#4530664 - 09/30/17 09:39 PM how long do you let the charging vehicle run?
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4848
Loc: Houston, Texas
This kind of goes along with my other thread, but I didn't want to derail it. Anyways, as recommended on here I bought some of those 1 gauge battery booster cables that are like 1/2" thick andt cost like 60 bucks. How long do you let the donor vehicle run when jump starting someone? I've heard if your cables are thick enough you can just start the vehicle without even running the donor vehicle, but we let it run for like 3 minutes at a high idle and my truck started right up.
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2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4530665 - 09/30/17 09:40 PM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4848
Loc: Houston, Texas
The part that had me curious was that the cables on the donor vehicle side were pretty warm for the first two feet or so.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4530671 - 09/30/17 09:48 PM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
14Accent Offline


Registered: 08/03/17
Posts: 390
Loc: MN
You were smart to buy the expensive cables. It never ceases to amaze me what passes for "jumper cables". Average starter draw is somewhere between 150 and 300 amps, depending on application. Assuming the "dead" battery is truly dead, you would need at MINIMUM 4 gauge wire, with 1/0 gauge preferable. [censored], I use a light 1/0 gauge to power just the subwoofer amplifier in my car, which pulls right around 100 amps when it's cranking out.

The heat in the cables is normal. Most likely due to resistance between the cable ends and the terminals. Did you jump the cummins in your signature? That thing will easily pull 250 amps while cranking.
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#4530674 - 09/30/17 09:52 PM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4848
Loc: Houston, Texas
Yeah. I was worried it wasn't going to work because the donor vehicle was a honda pilot with a tiny battery. I guess its the alternator that does the work though. I bet those cheap 8 gauge jumper cables would have melted.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4530675 - 09/30/17 09:53 PM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4848
Loc: Houston, Texas
It worked great and I was able to make the last ground connection to the lifting eye on the engine, which most engines don't have.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4530688 - 09/30/17 10:19 PM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
eljefino Offline


Registered: 06/15/03
Posts: 32632
Loc: ME
I try for a couple minutes. I've read that the jump donor should confiscate the jumpee's keys so they aren't in there hammering on their starter... and your alternator. I tell the recipient to hold off until I rev it then go for it... I figure my revving helps spread the load over all the sets of diodes in my alternator vs just one.

But I have fine luck with 10 gauge cables. When one looks at tables for amps and cable ratings there are assumptions about continuous use and voltage drops of only a couple percent. In reality if you can keep the suffering car from dipping below 9 volts or so during cranking, it'll catch.

Bigger cables are better, sure, but if they come with stiff clips or a poor interface to the terminal posts it's a problem.

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#4530701 - 09/30/17 10:30 PM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
Chris142 Online   content


Registered: 06/05/03
Posts: 16818
Loc: Deplorable in apple valley, ca
I let it run 10 minutes or so.
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#4530722 - 09/30/17 11:06 PM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
raytseng Offline


Registered: 12/11/08
Posts: 2333
Loc: CA
1. you can just attach the cars together. both off. wait 2 min then start the dead car.

2. only if thsts not working then you should start the donor car.

3. better yet just get a jump pack instead of jumper cables.

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#4530742 - 09/30/17 11:41 PM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
michaelluscher Offline


Registered: 10/07/12
Posts: 2419
Loc: Staten Island, NY
I give it 5 minutes
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#4530744 - 09/30/17 11:48 PM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
6 gauge or lighter cables I call "Charging cables".

They will jump a vehicle with a battery that's .1 volt too low to start other wise.

I did know a single mom who left her dome light on all night.
She called me in a panic (from another state)...
I told her she had to convince the person jumping her car it would take more than 5 minutes.
It took 15 minutes to get her dodge caravan running again.
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#4530807 - 10/01/17 02:16 AM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1810
Loc: Saskatchewan, Canada
With good cables you don't need to run the dead vehicle at all, but if you want to high idle for five minutes on the start vehicle it's OK. Turn everything off (lights, heater, radio, etc) on both unless you need the flashers going on the start vehicle. Be sure to run the dead vehicle for at least a half hour after a boost ("jump" for American readers) and blip the throttle up to at least 2000 RPM if you intend to just let it idle, since some alternators won't charge until they hit about 1600~1800 first briefly.
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#4530809 - 10/01/17 02:25 AM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
Colt45ws Offline


Registered: 08/15/06
Posts: 9638
Loc: Central Washington
Generally I try right away and if it doesnt work, I wait a few minutes with the booster vehicle running.
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#4530955 - 10/01/17 09:05 AM Re: how long do you let the charging vehicle run? [Re: Johnny2Bad]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4848
Loc: Houston, Texas
Originally Posted By: Johnny2Bad
With good cables you don't need to run the dead vehicle at all, but if you want to high idle for five minutes on the start vehicle it's OK. Turn everything off (lights, heater, radio, etc) on both unless you need the flashers going on the start vehicle. Be sure to run the dead vehicle for at least a half hour after a boost ("jump" for American readers) and blip the throttle up to at least 2000 RPM if you intend to just let it idle, since some alternators won't charge until they hit about 1600~1800 first briefly.




I've heard that, but I didn't think it would work since the battery on the booster vehicle is only a little bigger than a riding mower battery.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4530965 - 10/01/17 09:14 AM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
HerrStig Offline


Registered: 08/24/11
Posts: 9560
Loc: Boston, MA
Output over time is what starts a car, not physical size. A lithium pack can hold a lot of charge in a small space.

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#4530992 - 10/01/17 09:36 AM Re: how long do you let the charging vehicle run? [Re: motor_oil_madman]
eljefino Offline


Registered: 06/15/03
Posts: 32632
Loc: ME
You want a surface charge on the dead battery. ~14 volts coming in on the cables does this faster than ~12.5. Having the electrons "that much closer" is beneficial.

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