I don't know how fast the voltage regulator is in the mean green. It would be really cool if it re-used the PCM regulator already on the jeep. But if you are running a good 1 farad cap, you'd have to be draining a very heavy load before you worry.

Audio amplifiers need high voltage (the one i built for home need 75 volts DC), something a car does not have. Since reisiters only work for lowrering the voltage , and a transformer only work off of AC, you need to desing a special step up DC transformer. A cheep step up DC transformer uses 2 transistors to swith posative and negative to give a square wave AC volatge. Then the square wave is ran through a step up transofmer, then bridge-recvtified and ran through some caps to clean it up. So really, you could have a decent amount of AC on the power in side, and as long as it does not interfeer with the switching transistors, and have clean steped up voltage on the amp side.



For us normal folk, that is right. When we turn on a load that is too heavy for the alternator, the bat. will take it up for the needed amount of time. But if you were to watch the voltage it would drop down to battery voltage while the alternator could not keep up. Since we are talking about an amplifier that steps up at a fixed ratio, the voltage difference is multiplied by that ratio. For example. Lets say you had a 300 watt RMS amplifier that needs a constant 130 (about 10 times more than charging voltage) volts in order to pump out a sustained 300 watts. If your alternator can't handle that load and drops 2 volts to bat. voltage, you didn't lose 2 volts at the amp, you lost 20. The high voltage is the difference between clipping and a nice clean note.

That is why you see those chromed shiny capacitors hooked in line with a powerful amplifier. A capacitor is like a battery but it has a variable voltage and discharges much quicker. you can charge a capacitor to 15 volts, drain it then charge it to 9. With a good capacitor you can get thousands of amps out of one in a second, something you canÆt do with a battery.

The only bad thing about a capacitor is that if you look at how big a farad actually is you will see that it is equal to about 1/1000 of the size of a battery. they do discharge quickly, but the amount of charge that they hold is VERy small.
i have seen 25 farad caps and i think i might have to get one of those when i can afford it.

so far i have heard yes there are plenty of High output alternators for our application! but only found one brand, mean green, and then later found that it might not be the best quality (let me stress the word MIGHT).

what other brands are out there that woudl pump out over 140amps?

ive got a few friends with decent systems running off the "stock" alternator (unchanged since they bought it) in their jeeps with no problems. BUT i have had two alternators go out on two different cars because of my systems and not having a good enough alternator to begin with.. so im just trying to play it safe.

thanks guys

I think I would look to these guys and see what they have for me..
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />


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91-98 NEW JEEP CHEROKEE YJ HIGH OUTPUT ALTERNATOR 165A Item number: 7975711187

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10-day listing, Ends May-29-05 08:33:24 PDT
Start time: May-19-05 08:33:24 PDT
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Item location: Dallas,TX 1-800-607-0016
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Description







SquareTrade ® AP6.0



Load Boss High Output Alternators!
Computer Load Tested For Performance!

QUALITY HAS NO FEAR OF TIME!

WE GIVE YOU A LIFETIME WARRANTY!

Retail: $249.99


100 % NEW
Performance that will make you say"W0W!"
Alterstart Systems, Inc.

Established in the auto electric industry since 1986. We strive to offer the very best in customer service and part reliability.

You are bidding on a 100% NEW, made to original equipment specification alternator, that we have wound to 165 amps.

This alternator will drop right in place of your existing 90-amp unit and operates with the existing ecm voltage regulator.


Jeep Cherokee 91-98 2.5L and 4.0L,5.2L.
Dodge Dakota 97-88 2.5L.

Jeep Comanche 91-92 2.5L and 4.0L.

Jeep Grand Cherokee 92-98 4.0L,5.2L.

Jeep Wrangler 91-98 2.5L and 4.0L

This unit will provide 60-65 amps capability at 800 engine rpm and 165 amps at 1600 engine rpm.

You can use this high output alternator to power your 2000-watt stereo system. You could install this alternator just as a heavy-duty replacement for the original, this alternator when put on light duty could last a lifetime.



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A four gauge alternator power cable is required for proper battery maintenance. This new custom made power cable can be supplied for $25.00 extra. Please see our other auctions to purchase this item.


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We use only the highest quality bearings from NTN and the best component parts available in all my alternators and starters will supply this alternator with a two-year warranty.
THIS UNIT IS SUPPLIED WITH A 6 GROOVE PULLEY. THE 5.2L USES A 7 GROOVE PULLEY. YOU WILL HAVE TO SWAP THE PULLEY IF YOU HAVE A 5.2L ENGINE.

We have been established in the auto electric industry since 1986 and we are determined to be the best supplier of alternators and starters on eBay. Install our alternator with confidence, our technical experience is available to you toll free, call 8-5 PM central.

Bid now, and you should view my other high performance parts on auction.

Warranty:

We will replace, or repair the unit at our discretion when presented with original invoice. Your warranty starts on the day you buy the part and expires at the end of warranty period stated on the receipt or when you sell your vehicle.

To obtain a repair or replacement part, visit Alterstart's store or contact Alterstart at 1-800-607-0016 or alterstart@aol.com to arrange return shipping. Buyer is responsible for all shipping fees. Replacement units are warranted for LIFE after replacement.

The warranty does not cover failure due to installation on diesel application or improper installation, other defective parts, low fluid levels, abuse, over-crank, submersion in liquid or commercial, off-road or marine use.

THIS LIMITED LIFETIME WARRANTY REPRESENTS THE TOTAL LIABILITY OF ALTERSTART FOR ANY WARRANTIED PART, AND ALTERSTART MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. ALTERSTART SHALL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES.

Some states do not allow limitations on how long an implied warranty lasts, or exclusion or limitation on incidental or consequential damages, so the above limitations may not apply to you. This warranty gives you specific legal rights, and you may also have other rights, which vary from state to state.




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Buyer pays $16.00 UPS INSURED GROUND SERVICE freight in the lower 48 states (3-5 BUSINESS DAYS). TX residents pay 8.25% sales tax. There is a $10.00 handling and insurance fee in addition to the actual freight cost on all USPS shipments to APO/FPO Alaska and Hawaii and on all International shipments. I ACCEPT www.BIDPAY.COM ONLY FOR ALL INTERNATIONAL ORDERS .Please email me with your exact shipping address for shipping charges to Alaska and Hawaii and for all International orders.

Call 1-800-607-0016 for low rates on next day UPS delivery service in lower 48 states.


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Customer Service 1-800-607-0016


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LW.13341-165A-S6.NO REFUNDS.YOU MAY CLICK ON THE PAYPAL LOGO AND PAY alterstart@aol.com SECURELY AND QUICKLY WITH YOUR CREDIT CARD OR CHECKING ACCOUNT.PROVIDE YOUR PHONE # W/PAYMENT.WE SHIP TO CONFIRMED ADDRESS ON ALL PAYPAL TRANSACTIONS.YOU MAY CALL 1-800-607-0016 TO PAY WITH YOUR CREDIT CARD DIRECTLY.S&H QUOTED IS FOR UPS TO LOWER 48 STATES. ALTERSTART SYSTEMS INC. 4919 W. DAVIS ST. DALLAS, TX 75211.www.4alterstart.com




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Their home site is here: http://www.4alterstart.com/
Just from looking at their lifetime warranty I would buy from them in a heartbeat.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />

good find jim.. my cherokee is a 1990.. i wonder what makes them say that alternator only fits 91-97....

Go to their site! I never saw so many alts! they WILL have what you want.
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

hey guy....i didn't read all the advice, so my apologies if i repeat others words. i DO have first hand experience with this sort of set up. here is what you need:
1. run 4 or 5 gauge from the battery to the amps, put in an 80 amp fuse or circuit breaker in line close to the battery.a hint....go to a welder supply house and get the stuff much cheaper, less than half price, but no pretty colors.
2. divide the power with a power divider block just before the amps. use 8 gauge, or whatever it is that the normal power wire is, i forget the gauge.
3. use an optima battery, red top.
4. if you find that you are draining the battery (i doubt it), buy a capacitor for the bass amp, that's the one that sucks your battery dry!!!
i am running a rockford fosgate 200 IX on my sub + a JL Audio 300 watt amp on my 4 corners, no problems, and i'm not even using a capacitor. i never have problems. this system was in my cj7, with stock alternator, and now it's in my 1965 Rambler Classic with a 55 amp alternator.
any questions, hit me up here, or at jeepfun4u2@yahoo.com . good luck.....Rob

I actually purchased the Mean Green because of it's high output at low RPM's as well as their reputation. If I am going to be running KCs and have my stereo blasting while the bass thumps my rearview mirror off as I crawl over a rock, I still want to be able to start my rig when I stop for a soda break.
I'm not saying that Mean grean isn't a reputable company with a great product....or doesn't care for it's customers, all I'm saying is that mine went out after a few months and I sent it back in March....and tomorrow is June.
......That's all I'm saying.
<img src="/forums/images/graemlins/angry.gif" alt="" />

And THAT is all I need to know!! I certainly will not be the next MArch till June and not returned yet customer... I will take my chance on the Dallas dudes first OR even look elsewhere..
Fool us once shame on YOU! Fool...etc!
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

here is what i have found after a bit of research

http://www.mralternator.com/alternators/jeep.html


http://cgi.ebay.com/ebaymotors/ws/e...p;item=7957001369&category=33573


http://verizonsupersite.com/4alters...ery%3D90%20cherokee&catuid=10155
*says that one is also available in 180 amp.. call for details


my concern is that when i have the stereo, lights, and heater on my amp gauge likes to take a dive to about 12.5 volts... (im guessing.. cannot get an accurate figure since hte gauge just has lines, no numbers). but if it cannot take that kind of amp draw without suffering.. then it wont be able to handle my plans for the jeep.

i also have been rethinking it and thining of going with less stereo. now im just at running the speakers off the HU, and then running one mono block (650wrms) amp to one sub.. not two subs and 3 amps like i originally planned.