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how long do you let the charging vehicle run? #4530664
09/30/17 09:39 PM
09/30/17 09:39 PM
Joined: Nov 2009
Posts: 4,941
Houston, Texas
motor_oil_madman Online content OP
motor_oil_madman  Online Content OP
Joined: Nov 2009
Posts: 4,941
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.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530665
09/30/17 09:40 PM
09/30/17 09:40 PM
Joined: Nov 2009
Posts: 4,941
Houston, Texas
motor_oil_madman Online content OP
motor_oil_madman  Online Content OP
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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.

Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530671
09/30/17 09:48 PM
09/30/17 09:48 PM
Joined: Aug 2017
Posts: 558
MN
14Accent Offline
14Accent  Offline
Joined: Aug 2017
Posts: 558
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.


2013 Chevrolet Volt - Saves enough in fuel to pay for itself!

2003 Cadillac Seville STS - The winter "beater", it uses the Volt's fuel
Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530674
09/30/17 09:52 PM
09/30/17 09:52 PM
Joined: Nov 2009
Posts: 4,941
Houston, Texas
motor_oil_madman Online content OP
motor_oil_madman  Online Content OP
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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.

Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530675
09/30/17 09:53 PM
09/30/17 09:53 PM
Joined: Nov 2009
Posts: 4,941
Houston, Texas
motor_oil_madman Online content OP
motor_oil_madman  Online Content OP
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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.

Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530688
09/30/17 10:19 PM
09/30/17 10:19 PM
Joined: Jun 2003
Posts: 33,074
ME
eljefino Offline
eljefino  Offline
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Posts: 33,074
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.

Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530701
09/30/17 10:30 PM
09/30/17 10:30 PM
Joined: Jun 2003
Posts: 17,348
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
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Posts: 17,348
Deplorable in apple valley, ca
I let it run 10 minutes or so.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530722
09/30/17 11:06 PM
09/30/17 11:06 PM
Joined: Dec 2008
Posts: 2,407
CA
raytseng Offline
raytseng  Offline
Joined: Dec 2008
Posts: 2,407
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.

Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530742
09/30/17 11:41 PM
09/30/17 11:41 PM
Joined: Oct 2012
Posts: 2,464
Staten Island, NY
michaelluscher Offline
michaelluscher  Offline
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Posts: 2,464
Staten Island, NY
I give it 5 minutes


'06 Toyota Camry SE V6 3MZ-FE 100k
'01 Mercury Villager Estate VG33E 52k
'06 Ford Taurus SE Vulcan 60k
'13 Chrysler 300 3.6 Pentastar 230k
Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530744
09/30/17 11:48 PM
09/30/17 11:48 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530807
10/01/17 02:16 AM
10/01/17 02:16 AM
Joined: May 2013
Posts: 2,093
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline
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Posts: 2,093
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.


'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]
Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530809
10/01/17 02:25 AM
10/01/17 02:25 AM
Joined: Aug 2006
Posts: 9,804
Central Washington
Colt45ws Offline
Colt45ws  Offline
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Posts: 9,804
Central Washington
Generally I try right away and if it doesnt work, I wait a few minutes with the booster vehicle running.


-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2
Re: how long do you let the charging vehicle run? [Re: Johnny2Bad] #4530955
10/01/17 09:05 AM
10/01/17 09:05 AM
Joined: Nov 2009
Posts: 4,941
Houston, Texas
motor_oil_madman Online content OP
motor_oil_madman  Online Content OP
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Posts: 4,941
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.

Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530965
10/01/17 09:14 AM
10/01/17 09:14 AM
Joined: Aug 2011
Posts: 9,560
Boston, MA
HerrStig Offline
HerrStig  Offline
Joined: Aug 2011
Posts: 9,560
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.

Re: how long do you let the charging vehicle run? [Re: motor_oil_madman] #4530992
10/01/17 09:36 AM
10/01/17 09:36 AM
Joined: Jun 2003
Posts: 33,074
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,074
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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