Electrical upgrade advice

[Kiquee]

Hey everyone first time posting here. I need advice on electrical upgrades. My current setup is a nations 200 amp alternator, autozone agm under the hood, and an xs power 750p in the trunk. Im running a skar skv 2500 for a single 12 and a skar rp 150.4 for my mids/highs. Voltage rarely drops under 13v. Im upgrading subs to dual sundown x10s wired at 1 ohm. Im wanting to push them with at least 3k. Thing is the biggest alt they make for my car is a mechman 240 amp (2004 mustang) and my alt is less than a year old so im thinking just getting more batteries just not sure what exactly. Any advice is appreciated.

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[Firewalker]

What engine on the mustang? Should be able to get a 320 or 370 from some places. Got a J&S and love it, great customer service and really fast with their builds as well.

2005-2010 Ford Mustang 4.0L 250-320-370-400amp High Output Alternator

Upgrade your 2002-2009 Ford Mustang Alternator with a JS high-output alternator. Ensure reliable power for all electronic components, even under heavy load. Durable & performance-tested. Shop now!

js-alternators.com

 

[Kiquee]

What engine on the mustang? Should be able to get a 320 or 370 from some places. Got a J&S and love it, great customer service and really fast with their builds as well.

2005-2010 Ford Mustang 4.0L 250-320-370-400amp High Output Alternator

Upgrade your 2002-2009 Ford Mustang Alternator with a JS high-output alternator. Ensure reliable power for all electronic components, even under heavy load. Durable & performance-tested. Shop now!

js-alternators.com

Its 4.6 dohc, different engine from the regular mustangs

 

[Firewalker]

That don't matter. What matters is that the bolt up is the same as listed. If the alternator looks like that then you can bolt it up. You will be changing out the harness regardless if going up in a HO alternator from most companies. That link was searched using a 4.6. Post a picture of your alternator if it looks like that then you have a bunch of options.

 

[Kiquee]

That don't matter. What matters is that the bolt up is the same as listed. If the alternator looks like that then you can bolt it up. You will be changing out the harness regardless if going up in a HO alternator from most companies. That link was searched using a 4.6. Post a picture of your alternator if it looks like that then you have a bunch of options.

Alternator i currently have

200 Amp High Output Externally Regulated Alternator for 2003-2004 Ford Mustang Terminator Cobra 4.6L DOHC Supercharger

200 Amp High Output Externally Regulated Alternator for 2003-2004 Ford Mustang Terminator Cobra 4.6L DOHC Supercharger

www.nationsstarteralternator.com

Biggest one I could find for my car

S Series Billet 240 amp 03/04 Cobra - Machined finish

mechman, mechman alternators, high output alternator, mechmanalternators, motor swap, universal, custom, car audio, bass, basshead, subwoofer, amps, voltage, alternator, alt,

www.mechman.com

 

[1aespinoza 10+ year member]

Biggest one ive could fine for my car

220A as well but a better price.

 

[Grimmjoww]

What engine on the mustang? Should be able to get a 320 or 370 from some places. Got a J&S and love it, great customer service and really fast with their builds as well.

2005-2010 Ford Mustang 4.0L 250-320-370-400amp High Output Alternator

Upgrade your 2002-2009 Ford Mustang Alternator with a JS high-output alternator. Ensure reliable power for all electronic components, even under heavy load. Durable & performance-tested. Shop now!

js-alternators.com

Me and my Jeep buddies love JS. And for the OP I am running a 240a alternator currently with 2 agm batteries and I am close to 3k easy. Never dios below 13.4 and will hold 13.8 or higher at high idle.

 

[spokey9]

I got a 320a from j&s and 2 agm running a smart 3k and a rf power t400...about 13.8 is lowest I've ever seen at the amp...

 

[Firewalker]

Even though this says it is for the 3.8 what matters is the bolt pattern. Looks to be the same as the ones above. Available in 250 and 320. I would go with the bigger 320.

Got a J&S on my Explorer with a 69AH AGM with the big 3 and what not. Lowest I have seen when running full tilt is 14.0 and highest is 14.8.

I had a few companies telling me "nope that 4G is not going to be made" Or it was "sry casing won't fit" J&S fit perfectly with no issues and bolted up perfectly.

1994-2004 Ford Mustang 250amp Alternator

Upgrade your Ford Mustang with our 250-amp alternator, designed for the 1994-2004 model years.

js-alternators.com

Contact J&S willing to bet this one or one they have will bolt up just fine. Plus you are going to need a 1/2" to 1" shorter serpentine belt as well with any hairpin aftermarket alternator

 

[metalheadjoe 10+ year member]

Hey everyone first time posting here. I need advice on electrical upgrades. My current setup is a nations 200 amp alternator, autozone agm under the hood, and an xs power 750p in the trunk. Im running a skar skv 2500 for a single 12 and a skar rp 150.4 for my mids/highs. Voltage rarely drops under 13v. Im upgrading subs to dual sundown x10s wired at 1 ohm. Im wanting to push them with at least 3k. Thing is the biggest alt they make for my car is a mechman 240 amp (2004 mustang) and my alt is less than a year old so im thinking just getting more batteries just not sure what exactly. Any advice is appreciated.

Batteries are far more important than alternator to prevent voltage dips. Get 40ah of lifepo4 and you'll be good.

Nice car by the way. Mach 1 or cobra?

 

[Kiquee]

Batteries are far more important than alternator to prevent voltage dips. Get 40ah of lifepo4 and you'll be good.

Nice car by the way. Mach 1 or cobra?

Yea im mostly likely going to go that route. Dont plan on winning competitions or playing full tilt all the time. I watched some good videos last night on making your own lithium battery and its seems pretty straight forward.

And thank you its a cobra