So I’ve seen this thread before about what alternator is the best but that was back in 2012 and I would like to know what would be the best alternator now to get knowing how there’s a lot of new technology out. I’m in need of one because my battery light keeps popping up after doing a couple of pulls in the high rpm’s but goes away when I slow down
Updated choice for alternators on a 03/04 Cobra
- Thread starter Wonder
- Start date
I wouldn't go by just the flickering battery light. Even aftermarket ones will do this and voltage is fine. My Nations does it at high rpms once in awhile. I've data logged it and it's fine.
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I just installed a 240 amp Mechman. High quality piece. Very happy with it.
I had problems with the KMJ alternators and was done dealing with the headache. The Nations and the Mechman are expensive for a reason, they work.
I had problems with the KMJ alternators and was done dealing with the headache. The Nations and the Mechman are expensive for a reason, they work.
I’ll test out the voltage tomorrow morning. But I’m assuming it’s my alternator because when doing a wot pull I notice my headlights getting brighter and also my dash lights
I've been driving mine for over 2 years with the battery light on. At first I was worried to drive it like that but I've tested the alternator a few times and voltage is where it needs to be. I need to figure out why the light comes on intermittently.
theres been a couple threads about it, there was something about the aftermarket alternators but I dont recall the solution.
I would definitely log voltage before throwing an alternator at it.
It is a little frustrating with some of these aftermarket alternators where they either don't have or won't share what the output should be at a given rpm.
Been running this one now for 2 and a half year. No issues
200 Amp 8304 Alternator Ford Mustang Cobra w/ S/C 2003 2004 High Output HD NEW | eBay
Mustang Cobra. Ford Alternator. High Output 200 Amp. One Year Warranty.
www.ebay.com
Yea I have a alternator, I went to go test it out and it came back as a bad alternator
I’ve seen this one in an old thread before but I didn’t know if it’s still a go to option now a daysBeen running this one now for 2 and a half year. No issues
200 Amp 8304 Alternator Ford Mustang Cobra w/ S/C 2003 2004 High Output HD NEW | eBay
Mustang Cobra. Ford Alternator. High Output 200 Amp. One Year Warranty.www.ebay.com
I have a J2Fab 185 amp. It’s been great. I had a J2Fab 200amp on my 2001 GT that worked well too. I know it’s hit or miss with all these alternators. I got mine from Lethal Performance last summer I believe.
I was over spinning the shit out of a j2fab on my Mach and idle output was never sufficient. His answer was always to spin it faster… it was already pullied that it’d spin 22-23k at redline, it’s only supposed to spin to like 16k
I don’t doubt it. Mine seems fine. They are all hit and miss. I happened to get a good one.
If I were to get the j2fab is it a direct replacement or would I have to upgrade other things around it?
It is direct replacement but with more amperage (not just J2Fab specific) you need the wire upgrade. Mine came with the harness that adapts the J2Fab plug to the stock harness. Pretty much plug n play minus the wire upgrade.
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