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1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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Old 08-05-2006, 01:34 PM   #1 (permalink)
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which battery to jump start?

Which battery should be used to jump start my truck? I've never jumped it. Jumped plenty of vehicles with my truck, but never the other way around!

Thanks
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Old 08-05-2006, 01:36 PM   #2 (permalink)
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Re: which battery to jump start?

I have always used the one with the cable that goes to the starter, and ive never had any problems..
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Old 08-05-2006, 01:38 PM   #3 (permalink)
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Re: which battery to jump start?

It should not matter they are both connected in paralell.Either one will work. [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
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Old 08-05-2006, 04:36 PM   #4 (permalink)
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Re: which battery to jump start?

I'm not sure about the current engines. But I know on the 6.9, and I'm pretty sure on the 7.3, they were explicit in the owner's manual about always jumping off the passenger side battery. I'm not sure why. I'll use the passenger side if I ever have to jump off my truck.
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Old 08-05-2006, 09:06 PM   #5 (permalink)
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Re: which battery to jump start?

The reason you are told to jump off the passenger side battery is that if you are on a public street, it keeps you the furthest away from traffic.

The batteries are connected in parallel, so it makes no difference which one you use.
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Old 08-05-2006, 09:21 PM   #6 (permalink)
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Re: which battery to jump start?

The real reason is the battery cable to left batt. is a
smaller gauge. Resulting in a bit of a voltage drop.
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Old 08-05-2006, 10:18 PM   #7 (permalink)
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Re: which battery to jump start?

[ QUOTE ]
The real reason is the battery cable to left batt. is a
smaller gauge. Resulting in a bit of a voltage drop.

[/ QUOTE ]I thought the real reason was that the wire to the starter comes off the + terminal on the passenger side battery. Hence the shortest run of wire to the starter.
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Old 08-06-2006, 02:24 AM   #8 (permalink)
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Re: which battery to jump start?

[ QUOTE ]
[ QUOTE ]
The real reason is the battery cable to left batt. is a
smaller gauge. Resulting in a bit of a voltage drop.

[/ QUOTE ]I thought the real reason was that the wire to the starter comes off the + terminal on the passenger side battery. Hence the shortest run of wire to the starter.

[/ QUOTE ]

Same difference. [img]/ubbthreads/images/graemlins/tongue.gif[/img]
What would be the advantage of a shorter distance? [img]/ubbthreads/images/graemlins/shrug.gif[/img]
Less voltage drop from series resistance <lenght of wire being heated>
Wire that is heated constitutes a series load which will show a voltage drop equal to the value of the resistance to the load placed on cable. [img]/ubbthreads/images/graemlins/phoney.gif[/img]
[img]/ubbthreads/images/graemlins/smokin.gif[/img]
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Old 08-06-2006, 04:25 PM   #9 (permalink)
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Re: which battery to jump start?

Thanks guys.

I have something draining my battery. Had it on the trickle charger for a day and that kept it charged for about 3-4 days. Now to track down the drain!
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Old 08-07-2006, 04:49 PM   #10 (permalink)
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Re: which battery to jump start?

When my converter shorted internally and drained my battries [img]/ubbthreads/images/graemlins/blush.gif[/img](in the outback of West Texas) I needed to run cables to both batteries to produce the current needed to crank the motor. Granted they were smaller cables and the batteries were DEAD not just low but one set to one battery would just not do the job. I now carry two sets. A huge thanks to the Texan with the ford diesel that came by and stopped to help and carried two sets. [img]/ubbthreads/images/graemlins/smile.gif[/img]
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Old 08-07-2006, 07:25 PM   #11 (permalink)
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Re: which battery to jump start?

Well, it ended up being the alternator. Now we're back on the road. The batteries were low enough that the stereo would go in and out and the abs light showed up. Lots of wierd things happen when the batteries get low!
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Old 08-12-2006, 05:21 AM   #12 (permalink)
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Re: which battery to jump start?

"Lots of wierd things happen when the batteries get low! "

That's no joke! If you think our trucks are bad when an alt and then battery goes though, try my 1988 bmw 750iL. All dash lights going crazy, and the engine thinks it's got half failed and only runs on 6-cyl.
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Old 08-12-2006, 11:36 AM   #13 (permalink)
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Re: which battery to jump start?

Neither, jump starting can kill electronics. Not at the time of the jump start, but that is when the damage is done. Then a few years down the road the damaged trace on the pc board fails.
Electronics don't like voltage spikes and you get a hell of a voltage spike when you remove those jumper cables, beleive me.

Wayne B
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Old 08-12-2006, 12:02 PM   #14 (permalink)
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Re: which battery to jump start?

[ QUOTE ]
Neither, jump starting can kill electronics. Not at the time of the jump start, but that is when the damage is done. Then a few years down the road the damaged trace on the pc board fails.
Electronics don't like voltage spikes and you get a hell of a voltage spike when you remove those jumper cables, beleive me.

Wayne B

[/ QUOTE ]

So how do you get a dead-in-the water 8000 lb truck off your driveway and to the shop besides towing it? [img]/ubbthreads/images/graemlins/shrug.gif[/img] I agree that it's not the best alternative, but what else can be done? (I'm not being a needler, I'm actually really curious!) I always make sure the ventilation fans are on as I've heard that helps when jump starting.
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Old 08-12-2006, 04:29 PM   #15 (permalink)
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Re: which battery to jump start?

Here is a trick I learned when I used to drive a wrecker for AAA.

Have the person in the vehicle being jumped turn their headlights on as soon as the vehicle starts. This will help the voltage regulator from sending a large spike to the vehicle's electrical system.

Just my 2 cents.

Marc
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