Battery connection for smart charging question

[2021CSGTJH12]

Hey folks, when storing your Mustangs (mine is 2021 Mustang GT convertible CS roughly 7100 miles) what’s the proper way to connect a smart charger/maintainer?

I’ve read that because the car has a battery monitoring sensor on the negative terminal, connecting the charger directly to the battery posts may bypass that sensor and affect how the car tracks the battery’s state of charge.

Instead, some people recommend connecting the positive clamp to the battery and the negative clamp to a chassis ground point so the system can properly register the charge.

What’s the correct setup you all are using? I have a NOCO 10amp smart charger-maintainer and always hooked directly up to negative terminal.

Thanks

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[I Bleed Ford Blue]

I hooked the battery tender directly to the battery on my 17 vert and when I traded it in 23 for the mach 1 it still had the original battery. YMMV.

 

[23GreenGremlin]

Positive can go direct to the terminal but negative must be before the BMS which is connected directly to the negative terminal. If you connect direct to the negative terminal the Battery Monitoring System (BMS) will not read the flow and recognize it. It will eventually self-correct but that is not the best way to charge your vehicle. Luckily, there are a number of easy points to connect to near the battery. In the attached image you can see my battery tender pigtail in the orange circle. The red circle on the left image is where my negative eyelet is connected. The red circle on the right with the fuse box open is where my positive eyelet is connected.

 

[2021CSGTJH12]

Positive can go direct to the terminal but negative must be before the BMS which is connected directly to the negative terminal. If you connect direct to the negative terminal the Battery Monitoring System (BMS) will not read the flow and recognize it. It will eventually self-correct but that is not the best way to charge your vehicle. Luckily, there are a number of easy points to connect to near the battery. In the attached image you can see my battery tender pigtail in the orange circle. The red circle on the left image is where my negative eyelet is connected. The red circle on the right with the fuse box open is where my positive eyelet is connected.

thanks for the images. Why didn’t you connect your positive directly onto the positive terminal and went to the fuse box ?

 

[2015 Silver GT]

How many threads do we need on this? Does anyone actually look in their owners manual anymore?

 

[23GreenGremlin]

thanks for the images. Why didn’t you connect your positive directly onto the positive terminal and went to the fuse box ?

Just easier. The point where I connected to positive still goes directly to the positive terminal. The size of the eyelets on my charging cable pigtail and the length of the pigtail were a perfect match for the points I used.

 

[Skye]

https://www.mustang6g.com/forums/threads/batter-tender-battery-connection.172738/

This thread includes several reference photos. My inputs are posts 21, 22 and 25.

 

[ORRadtech]

How many threads do we need on this? Does anyone actually look in their owners manual anymore?

No, most people don't. Nor do they use a search function. It's just the nature of people and fourms to simply ask questions. You can rail against it or just let it be. My blood pressure is better if I just let things go.

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