yea i have a very very high end custom audio setup in my car, and my stock alternator crapped out on me about 3 months back, i got a mid 90's cobra alternator that pushes alot more amps, seemed to help alot of problems, it was very very cheap fix, better off getting a nice new alt, i think my mechanic charged me $150 for evrything installed, which was nice becuase he had to custom make a bracket to get the 96 cobra alternator fit in my 91 fox
yea same here, 3 alpine amps, 1 for each sub and 1 for the mids/highs, my lights still go nuts when the bass hits, i have a 5 farad cap i got to install, that will make the problem a little less but its to friggen cold up here in CT to work on my car!!! thats another thing, if your running any audio or alot of power draining things, a good strong battery (i.e. optima yellowtop) and a higher output alternator, (i.e. more than ur stock 85amp alt) will eliminate alot of power problems
You can use a 94-95 Mustang GT 120amp alt. I have done the upgrade myselft and it was simple. You will need to grind some of the bracket away, but that is the hardest part if you can do the wiring. There are instructions (3G Upgrade) on here or on many other sites dedicated to Mustangs.
I have two Fosgate amps pushing around 2000 watts in my car and the lights do not dim. The only time the alt can not keep up is when I have the radio blasting, lights on, and the fan running at high! I recommend the 3G install.
The First thing I would do is check for a parasitic Draw.
With the meter on the Amps reading and everything off. Disconnect the positive cable and put the meter inline. See what it reads. To help to prevent blowing the fuse in the meter from the Amp spike. Put one lead on the terminal and the other on the battery. Then slide the cable off then see what it reads.
Im not sure what the Specs are for the mustang but most cars are like .025 Amp draw.
If it is alot higher then start pulling fuses one at a time and watch the meter. When you see the meter drop then it is on the circuit of the fuse that you just pulled.
I had the exact same symtoms when my alt went bad. It is probably a bad diode which is stuck closed I believe it is. It creates a draw while the car is not on, and drains the battery, fix it soon, or it will get really bad, really quick, trust me. You can also check out PA Performance, they have a lifetime warranty, and have lower than a 2% failure rate. If your alternator takes a complete crap, it will take your battery with it, so be prepared...good luck
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more!