Battery Aux Wiring

[Hobkvet]

Hope this is the right place- I was about to wire up my 12000 winch and when I looked at these small lugs on the battery HOW do I attach 1/0 ga cable lugs to these small terminals- Any help asap please- yes, I am going to add a cutoff switch. Also since this is my first new truck since 1980 how will adding the winch effect the battery management system if at all- OH and is that metal bolt some kind of ground? Thanks -

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[sporkfed]

Did you ever figure this out? I'm also needing to do this.

 

[Buyer2021]

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Highly recommend them but you must use a proper crimp tool for your wire gauge for quality results, I use this

WBHome Hydraulic Wire Crimper Battery Lug Terminal Cable Crimping Tool, 8 Dies, 12 Ton - Amazon.com

 

[Je1279]

Here is another option.

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[Buyer2021]

Here is another option.

https://www.google.com/aclk?sa=l&ai...WKAxUJhYkEHbZXMRAQwg8oAHoECAYQDA&nis=7&adurl=

Take care that you understand the implications of using a battery post system that places ground returns (negative connections) between the battery sensor and the negative battery post.

Generally speaking that is not a desirable arrangement because the BMS will not account for those loads. Only ground returns (negative connections) to the chassis or to the bolt on the terminal 'after' the BMS sensor will be accounted.

Positive battery loads can be connected directly to the positive battery terminal, no worries. It's the negative side only that requires careful consideration and proper connecting points to ensure that all of the BMS stuff works as intended.

 

[SpaceWhiteF150]

Are you just wondering where to put your power and ground?

 

[Je1279]

Take care that you understand the implications of using a battery post system that places ground returns (negative connections) between the battery sensor and the negative battery post.

Generally speaking that is not a desirable arrangement because the BMS will not account for those loads. Only ground returns (negative connections) to the chassis or to the bolt on the terminal 'after' the BMS sensor will be accounted.

Positive battery loads can be connected directly to the positive battery terminal, no worries. It's the negative side only that requires careful consideration and proper connecting points to ensure that all of the BMS stuff works as intended.

Valid concern. I believe they only sell this version with both terminals, but as you mentioned, I would only use the positive terminal and find a suitable location for the ground lug.

 

[sporkfed]

Take care that you understand the implications of using a battery post system that places ground returns (negative connections) between the battery sensor and the negative battery post.

Generally speaking that is not a desirable arrangement because the BMS will not account for those loads. Only ground returns (negative connections) to the chassis or to the bolt on the terminal 'after' the BMS sensor will be accounted.

Positive battery loads can be connected directly to the positive battery terminal, no worries. It's the negative side only that requires careful consideration and proper connecting points to ensure that all of the BMS stuff works as intended.

Thanks for pointing this out. For a winch, as I'm looking to wire up, should the negative be run through the BMS or outside it? I don't want to fry the BMS with 500 A, but I also don't want to kill my battery accidentally.

 

[Buyer2021]

For a winch, as I'm looking to wire up, should the negative be run through the BMS or outside it? I don't want to fry the BMS with 500 A, but I also don't want to kill my battery accidentally.

FWIW #1 - The following is clipped verbatim from the 2022 F150 Workshop Manual, section 414-00 Charging System - General Information, and is the same for all engines:

Battery Monitoring Sensor connection ​

​

The Battery Monitoring Sensor is clamped directly to the negative terminal of the battery and grounds to the vehicle at the chassis ground connection point by means of a thick (25 to 35mm²) cable and eyelet. External customer loads must only be connected to the vehicle at the customer battery connection point. If the external customer load is connected at the negative battery post, the Battery Monitoring Sensor accuracy cannot be guaranteed.​

​

It is recommended that the Battery Monitoring Sensor pole clamp is not removed unless a battery replacement is required. Should the battery need to be isolated, this should be done by disconnecting the ground eyelet at the chassis ground.​

FWIW #2 - I don't find anything in the 2022 F150 Workshop Manual indicating a current limit for the BMS, but that doesn't mean there isn't one.

FWIW #3 - Google search revealed this post claiming it's good for up to 1200 Amps (I have no idea if that is applicable / correct for your situation)

Bottom line from me ...... I don't know the definitive answer to the question for your specific situation, so can't / won't make any representations for your case.

Good Luck!

 

[Hobkvet]

Take care that you understand the implications of using a battery post system that places ground returns (negative connections) between the battery sensor and the negative battery post.

Generally speaking that is not a desirable arrangement because the BMS will not account for those loads. Only ground returns (negative connections) to the chassis or to the bolt on the terminal 'after' the BMS sensor will be accounted.

Positive battery loads can be connected directly to the positive battery terminal, no worries. It's the negative side only that requires careful consideration and proper connecting points to ensure that all of the BMS stuff works as intended.

So what IU think you're saying is to ground thing here (Yes ground return) or maybe to the frame itself for aux type things like my winch??

 

[Hobkvet]

with the battery terminals shown below there is a LUG that simply goes from the neg post to the neg BMS hook up OR is it better to just ground what needs to be grounded to the frame or that place shown with the red arrow that says "RETURN" in the other reply

 

[Hobkvet]

Are you just wondering where to put your power and ground?

YUP

 

[SpaceWhiteF150]

I put power on the battery and ground on the post in front of the battery!

 

[Je1279]

I put power on the battery and ground on the post in front of the battery!

I think this is a good solution.

 

[Big Dog Daddy]

FWIW #2 - I don't find anything in the 2022 F150 Workshop Manual indicating a current limit for the BMS, but that doesn't mean there isn't one.

The BMS Sensor is really just a fancy looking inductive pickup. There's nothing you can really do to hurt the sensor, it's only limitation would be how much current you can pass thru it's center bolt connector.

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