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Old 03-17-2008, 01:38 PM   #1 (permalink)
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dual alternators??

Anyone ever try this or hear of it being done? I know some newer trucks have it. I figured it would be a better set up than dual batteries, or not? I have a spare alt for my danger ranger and could fab a bracket to mount it in place of the ac compressor. Tell me what you guys think.
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Old 03-17-2008, 01:43 PM   #2 (permalink)
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This is my setup dual charging systems and welder , not of CAUTION when alternator #2 is full fielded for welding or recepticle it can produce 150VDC (shock hazard) you need to bring engine down to idle or switch off field voltage .



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Old 03-17-2008, 01:46 PM   #3 (permalink)
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If you tried to charge one battery with two alternators, you'd have to have both alternators with exactly matched outputs (ain't never gonna happen) or they end up fighting each other. Dual alternators is nothing new or difficult... you just have two completely independent 12V systems on one vehicle. One alt. charges one battery, the other alt. charges a second battery. The two 12V systems need to isolated from one another.
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Old 03-17-2008, 01:53 PM   #4 (permalink)
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thanks i just read that somewhere. I want the one seperate system to run a winch and possibly have a normal 120v receptical.
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Old 03-17-2008, 01:55 PM   #5 (permalink)
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I run two systems -- alternator and batterries are fully independent on the charge side, but tied together on ground. I overkilled the grounding, with that in mind.

It works well, and I have a beefy solenoid that allows me to jump them to connect the batteries when I want, and enough cable to flip-flop connections if I need.

Randii
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Old 03-17-2008, 02:56 PM   #6 (permalink)
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sounds like a pretty good setup
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Old 03-17-2008, 03:01 PM   #7 (permalink)
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I think the only reason to run dual alt's on a wheeler is to have the second that is independant from the charging system for a on-board welder. Other than that... dual batts will get it done for winching. WTF are you trying to power anyhow... christmas lights on your moon visor?
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Old 03-17-2008, 03:42 PM   #8 (permalink)
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I think the only reason to run dual alt's on a wheeler is to have the second that is independant from the charging system for a on-board welder.
That's available, too.

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WTF are you trying to power anyhow... christmas lights on your moon visor?
Electric water pump and electric fan at a crawl... mix in heated seats for the wife, and a fresh air blower for the dog, and I'm almost as pimp as your average 'neck in a chrome buggy.

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Old 03-17-2008, 03:45 PM   #9 (permalink)
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Two alternators one battery
http://www.balmar.net/page21-centerfielder.html

You could also use the regulator from one alt and run both fields.

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Old 03-17-2008, 04:46 PM   #10 (permalink)
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That's available, too.


Electric water pump and electric fan at a crawl... mix in heated seats for the wife, and a fresh air blower for the dog, and I'm almost as pimp as your average 'neck in a chrome buggy.

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I just installed a trail back massager for my wife in the rig
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Old 03-17-2008, 05:05 PM   #11 (permalink)
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Quote:
Originally Posted by Mechanos View Post
If you tried to charge one battery with two alternators, you'd have to have both alternators with exactly matched outputs (ain't never gonna happen) or they end up fighting each other. Dual alternators is nothing new or difficult... you just have two completely independent 12V systems on one vehicle. One alt. charges one battery, the other alt. charges a second battery. The two 12V systems need to isolated from one another.
The factory dual alternator installations have a tendency to eat alternators for this reason. If you need more current output, get one big alternator for the best performance or separate your power systems.
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Old 03-17-2008, 05:25 PM   #12 (permalink)
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I have two alternators on my Tj:











img]http://www.jeeptuning-foto.com/albums/userpics/10019/05112007%28001%29.jpg[/img]



We do a lot of winching in our competitions over here therfore we need to recharge the batterys as fast as possible.
I instaled a Mercedes Benz 150A alternator with an external regulator.

The 150A alt is running on 14.4 Volts, the origianal 120A unit comes in as the tension during winching go´s under 14Volts.
i testet the setup at a race last october and it worked just great!
During normal conditions (my TJ is my Dalydriver) i had no problems reguarding this setup!
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Old 03-17-2008, 06:33 PM   #13 (permalink)
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I run to seperate 12v systems on my rig. One setup is just for the electric fans and the winch(don't have yet). I use the single wire chevy alternators. I'm pretty happen with it. Although I do have a short somewhere in the wiring when I installed the painless harness.
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Old 03-17-2008, 07:31 PM   #14 (permalink)
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I just installed a trail back massager for my wife in the rig
Huh, I guess my wife's gonna be riding with you, too.

Randii (still got the dog, at least)
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Old 03-17-2008, 07:40 PM   #15 (permalink)
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I have a 300A large case GM alt as my main and a 120A ford unit as my secondary. The secondary is for welding

There's not point in having dual alts if you get a big one uless it's for this reason.
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