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Unread 12-08-2018, 05:57 PM   #1
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Default Battery cable lug?

I just started making my own cables and I know it's not ideal, but can you use a lug with a 3/8" hole on a 5/16" stud?
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Unread 12-08-2018, 06:10 PM   #2
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Default Re: Battery cable lug?

Solder or crimp? I would think you'd be fine as long as the bond is tight.
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Unread 12-08-2018, 06:10 PM   #3
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Default Re: Battery cable lug?

I wouldn't do it. The whole point of "good" cables is to have the least amount of resistance in the cable (low AWG), a low resistance connection from cable to lug, AND the lug to battery terminal. This is your highest amperage connection, so the more "meat" you have in contact with the battery terminal, the better.
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Unread 12-08-2018, 06:17 PM   #4
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Default Re: Battery cable lug?

There are two possible issues depending on the application.

The first is reduced surface contact if the mating surface is not wide enough to contact the entire lug which can happen in motor studs or solenoid nuts.

The second is facilitating how quick the connection can get loose since the lug can move more freely around the stud.

Check the die fitting if You are using a hydraulic press as well, here is a picture showing a 1/0 Die used on 1/0, 2ga and 4ga lugs.

You should try to get a crimp like the one on the 4ga cable using the 1/0 Die, otherwise You will crush a lot of strands and/or weaken the lug:


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Unread 12-08-2018, 06:48 PM   #5
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Default Re: Battery cable lug?

If I recall, the solenoid lugs are larger than all the others, but a reversing contactor may also be.
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Unread 12-08-2018, 07:01 PM   #6
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Default Re: Battery cable lug?

Quote:
Originally Posted by yurtle View Post
I wouldn't do it. The whole point of "good" cables is to have the least amount of resistance in the cable (low AWG), a low resistance connection from cable to lug, AND the lug to battery terminal. This is your highest amperage connection, so the more "meat" you have in contact with the battery terminal, the better.
Yes, I figured that, but you're really only looking at a difference of .031". Like I said, I know it's not ideal, but how much more resistance would this create?
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Unread 12-08-2018, 07:04 PM   #7
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Default Re: Battery cable lug?

Quote:
Originally Posted by Sergio View Post
There are two possible issues depending on the application.

The first is reduced surface contact if the mating surface is not wide enough to contact the entire lug which can happen in motor studs or solenoid nuts.

The second is facilitating how quick the connection can get loose since the lug can move more freely around the stud.

Check the die fitting if You are using a hydraulic press as well, here is a picture showing a 1/0 Die used on 1/0, 2ga and 4ga lugs.

You should try to get a crimp like the one on the 4ga cable using the 1/0 Die, otherwise You will crush a lot of strands and/or weaken the lug:


Id be worried about the second issue since the lug can move around the stud. If torqued properly, even though it did have extra clearance, would the lug loosen up from the battery stud over time?
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Unread 12-08-2018, 07:05 PM   #8
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Default Re: Battery cable lug?

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Originally Posted by 70oldsracer View Post
Yes, I figured that, but you're really only looking at a difference of .031". Like I said, I know it's not ideal, but how much more resistance would this create?
Or how much money would it cost to do it right?

Dunno, but I like to stick with what's spec'ed.
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Unread 12-08-2018, 07:06 PM   #9
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Default Re: Battery cable lug?

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Originally Posted by yurtle View Post
If I recall, the solenoid lugs are larger than all the others, but a reversing contactor may also be.
Reversing contactor has 3/8" studs. It would only be one wire that would have a larger hole and it's the wire coming off the solenoid going to the Battery Main+.
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Unread 12-08-2018, 07:09 PM   #10
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Default Re: Battery cable lug?

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Originally Posted by yurtle View Post
Or how much money would it cost to do it right?

Dunno, but I like to stick with what's spec'ed.
Lol! It's not even money, it's me being lazy. I would just need to cut the lug off and solder the correct lug on and heat shrink. I guess I'll just do it, why skimp now.

Thanks
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