2025 GT Premium stock alternator "amperage?"

[DarkkMatter]

I'm designing a system for the Mustang, and I'm trying to find out what the stock alternator amperage is on the "GT Premium" 2025 model.
Anyone able to find this out?

Tried searching the net and Grok AI tells me this:

For the 2015-2023 Mustang GT Premium trims, the stock alternator typically ranges between 175 and 200 amps, depending on the specific configuration (e.g., whether it has heated seats or other high-draw electrical options). Ford has been increasing alternator output over the years to accommodate modern electronics, performance demands, and additional features in premium trims. Given that the 2025 Mustang GT Premium is part of the S650 generation (which began in 2024), it’s reasonable to assume the alternator amperage would be similar or slightly improved to handle advanced tech like digital dashboards, enhanced audio systems, and potential performance upgrades.
Without official 2025 documentation, I’d estimate the stock alternator for the 2025 Mustang GT Premium to be in the range of 175-200 amps, likely leaning toward 200 amps if Ford continues to prioritize electrical capacity for premium features.

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[Abilor]

Ditto - adding 1000W amp with about 90A draw. If this is true, then Big 3 are probably also stout, and can run thus all day long. Anyone confirm?

 

[DarkkMatter]

Ditto - adding 1000W amp with about 90A draw. If this is true, then Big 3 are probably also stout, and can run thus all day long. Anyone confirm?

Going to open the hood tomorrow and see if I can find a sticker on the alternator with the amperage rating. I'll post a picture for confirmation.

 

[Abilor]

Going to open the hood tomorrow and see if I can find a sticker on the alternator with the amperage rating. I'll post a picture for confirmation.

Good deal. I convinced my wife to help layer dynamat in the trunk, and the sub box is built. Getting closer...

 

[Decible]

Ditto - adding 1000W amp with about 90A draw. If this is true, then Big 3 are probably also stout, and can run thus all day long. Anyone confirm?

I was told back in the S550 days the big 3 wasn’t possible due to the smart charging system. I was also told an upgraded alternator wasn’t possible.

 

[DarkkMatter]

I found it at bottom right of the engine. And 190 was on a sticker, so assuming 190 amps.
I got the 401A too.

 

[Abilor]

I found it at bottom right of the engine. And 190 was on a sticker, so assuming 190 amps.
I got the 401A too.

Very cool, thanks!

 

[roket]

i was actually just looking at this too, but for a different reason. i am happy with the sound system, but want to add a 500W or so inverter so i can have as much power as i could possibly need. Ford only has one alternator listed, being the supposed 190A one. if it actually is 190A, i wonder how likely it is that the stock wiring can handle a 240A? granted, i dont actually know how much wattage surplus there is with the 190A alternator

 

[Abilor]

i was actually just looking at this too, but for a different reason. i am happy with the sound system, but want to add a 500W or so inverter so i can have as much power as i could possibly need. Ford only has one alternator listed, being the supposed 190A one. if it actually is 190A, i wonder how likely it is that the stock wiring can handle a 240A? granted, i dont actually know how much wattage surplus there is with the 190A alternator

Really, one of us should get some proper electrical monitoring tools and see. I'm willing to be a guinea pig after installing my 1000W RMS JL, but I don't have the gear. Good, cheap measuring tool?

 

[DarkkMatter]

i was actually just looking at this too, but for a different reason. i am happy with the sound system, but want to add a 500W or so inverter so i can have as much power as i could possibly need. Ford only has one alternator listed, being the supposed 190A one. if it actually is 190A, i wonder how likely it is that the stock wiring can handle a 240A? granted, i dont actually know how much wattage surplus there is with the 190A alternator

I think you can calculate it by doing 190A x (battery voltage). So 190A x 13V = 2,470 Watts.

Yeah, I checked with Grok AI:

To calculate the wattage produced by a 190 amp alternator, use the formula:
Watts = Amps × Volts
Steps:

1. Determine the voltage: Most automotive alternators operate at around 12 to 14.4 volts in a standard vehicle system (typically 13.8V when charging). For heavy-duty or specialized systems, voltage may vary (e.g., 24V for trucks).
2. Multiply amps by volts: A 190 amp alternator at 13.8 volts produces:
   190 \times 13.8 = 2,622 \, \text{watts}

Key Points:

• The actual output depends on the system voltage, which can fluctuate slightly based on the vehicle's electrical load and alternator efficiency.
• For a 12V system, wattage would be:
  190 \times 12 = 2,280 \, \text{watts}
• For a 24V system, it would be:
  190 \times 24 = 4,560 \, \text{watts}
• Real-world output may be slightly lower due to inefficiencies (e.g., heat loss or load variations).

If you know the specific voltage of your system, let me know, and I can refine the calculation!

 

[roket]

i checked on my Mustang and the alternator fuse is rated for 275A, so logic dictates that the cable itself can handle more than that; after all, there is no use in putting such a high amperage fuse if the cable it's attached to fails sooner than that

 

[DarkkMatter]

i checked on my Mustang and the alternator fuse is rated for 275A, so logic dictates that the cable itself can handle more than that; after all, there is no use in putting such a high amperage fuse if the cable it's attached to fails sooner than that

I'm wondering if the DarkHorse alternator isn't 275 Amps. I had read very few comments online that suggested that the PP or DH alternators were at that mark. Could be wrong.

I agree though with what you said.

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