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Old 11-15-2013, 01:29 PM
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Battery cable question

I'm building a C cab and due to space restrictions, I have to mount the battery towards the back. What gauge positive cable would I need to use for a 10' run. Thanks.

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Old 11-15-2013, 01:59 PM
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1/0

Unless the engine is a big high compression blown---
A minimum size is 1/0 for the positive.
Also run a 1/0 ground direct to the engine. Don't use the frame for the battery ground.


vicrod
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Old 11-15-2013, 04:33 PM
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I have used 0/0 jumper cables several times for neat long run cables. I get them for about 50 bucks for 16 feet, cut off the clamps and they are welded together for a slick run to the front.
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Old 11-15-2013, 05:29 PM
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I would use welding cable 2/0 or 1/0 for a 10 foot run for + and - its very flexable, this may help Welding Cable - 0 AWG Cable info and sales

Even though you run a large 1/0 ground wire directly from the battery to the engine you still need to ground the body and frame and if your running an aluminum radiator its good to ground it too if its an insulated mount (rubber) it will help reduce electrolysis (corrosion) in the radiator! This is caused from an electrical charge running through coolant; electrolysis will usually occur if there is a defective or missing ground on one of the numerous potential electrical sources. Most commonly seen in late model vehicles because they have aluminum radiators the early models ran copper and brass. Never ground your electric fan or anything else to the radiator!!!

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Last edited by painted jester; 11-15-2013 at 05:57 PM.
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Old 11-15-2013, 05:35 PM
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X2 on the 1/0 welding cable - flows lots of amps and is flexible. Also agree on running the ground to the engine (bellhousing bolt works well) instead of the frame. Then run a ground from that bolt to the frame and to the ground on your fuse panel.
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Old 11-16-2013, 07:30 AM
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Thanks for the replies guys, I appreciate it.


Bob
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Old 11-16-2013, 08:06 AM
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Would this wire be suitable. Thanks.

Amazon.com: 10 feet of 2 gauge red battery cable: Automotive Amazon.com: 10 feet of 2 gauge red battery cable: Automotive
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Old 11-16-2013, 10:53 AM
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Here's a chart comparing wire gauges and amp capacity.
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Old 11-16-2013, 11:25 AM
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Quote:
Originally Posted by Bob88 View Post
You would have to know the strand count and AWG size of the wire to compare two pieces of cable. Welding cable is more flexible because the individual wires in the cable are smaller diameter and more of them than that cheezy cable you get at Autozone or other outlets.

Welding Cable Class K
Class K welding cable is more commonly used, has 30 awg strandings and is available with a red or black jacket.

Welding Cable Class M
Class M welding cable offers better flexibility due to thinner 34 awg stranding and a more durable orange jacket.
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Old 11-16-2013, 12:14 PM
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I agree with tech. Welding cable is the way to go.

350 amps, for 10 feet, with a 2% voltage drop, starting with a 13.8 battery voltage, would drop to 13.5272, and at a length of 10.12..
00 Gauge (2/0) 9.3mm/67.4mm2

That's providing you start with a fully charged good battery.
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Old 11-26-2013, 09:03 AM
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I think this is the correct cable. Am I right?? Thanks for any help.

2 AWG Welding Cable Class K | WireAndCableToGo.com

Bob
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Old 11-26-2013, 09:13 AM
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Looks good to me. All those nice strands, should do the trick...
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Old 11-26-2013, 10:03 AM
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Just want to point out that there is a BIG difference between AWG 2 and AWG 2/0 (00).


Quote:
Wikipedia AWG is colloquially referred to as gauge and the zeros in large wire sizes are referred to as aught /ˈɔːt/. Wire sized 1 AWG is referred to as "one gauge" or "No. 1" wire; similarly, smaller diameters are pronounced "x gauge" or "No. X" wire, where x is the positive integer AWG number. Consecutive AWG wire sizes larger than No. 1 wire are designated by the number of zeros:
No. 0, typically written 1/0 and is referred to as 1 "aught" wire
No. 00, typically written 2/0 and is referred to as 2 "aught" wire
No. 000, typically written 3/0 and is referred to as 3 "aught" wire,

and so on.
Welding Cable Size Chart

PS.
Would someone explain to me WHY "flexibility" is a concern in this particular case?
Is the OP planning to roll his battery cables up every night?

In other words ... if we're talking "booster cables" ... I can see where flexibility would be a factor.
But for permanently secured cables ... not so much!
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Last edited by 66GMC; 11-26-2013 at 10:14 AM.
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Old 11-26-2013, 11:53 AM
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I guess I still don't understand the difference between 2/0 and 2 AWG. Is 2/0 wire larger ?? Flexibility really isn't a problem, just need to know which wire would be best for the length I need. Thanks again.

Bob
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Old 11-26-2013, 12:00 PM
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To clarify, you need to know what the amps are you have to use, and the distance you have to run the amps.

ps: That is a good point. Fixed, just to carry the, a, load, in my thinking, could be either.
The main purpose of the multiple strands, flexible or not, is to carry the amount of amperage, while keeping the voltage up.
Voltage drops, that slows the transfer, and amperage goes up, along with the heat, and burn factor. (smoke).

Last edited by Denny; 11-26-2013 at 12:05 PM.
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