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post #1 of (permalink) Old 02-27-2003, 10:08 AM Thread Starter
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Alternator questions

would there be any drawbacks to using summit's 1 wire alternator on my jeep or truck or both for simplicity and cost reasons (100 amp for I think around $90)?

after taking the computer out of the loop, wouldnt its function in the voltage regulation be removed, making a one-wire alternator desireable?
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post #2 of (permalink) Old 02-27-2003, 10:16 AM
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Re: Alternator questions

1. One wire alternators are nice for simplicity,
2. Keep rebuild parts in your spares kit,
3. They aren't too great for high amperage usage,
4. Due to internal regulation.
5. For an average vehicle, they're fine...
6. The ECM removal on the 85 CJ wouldn't have any effect.
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post #3 of (permalink) Old 02-27-2003, 10:16 AM
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Re: Alternator questions

I was going to reccomend the 7294-P for the easiest solution. Puts out close to 100, cheap and is a bolt in solution. However, I think you might be looking for something else.
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post #4 of (permalink) Old 02-27-2003, 10:33 AM
 
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Re: Alternator questions

7294-P What part # is that for...Napa? Sorry I don't know that one. Thanks, I am interested in upgrading the alternator in my cj.

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post #5 of (permalink) Old 02-27-2003, 10:41 AM
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Re: Alternator questions

It's the manufacturer's PN#. You should be able to reference that # at any part store and they SHOULD be able to figure it out. Different stores will add their #'s or letters before the "7294-P." Check out this post. Bob has posted more info and pics. It is a sweet upgrade. [img]images/graemlins/grin.gif[/img]
7294-P
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post #6 of (permalink) Old 02-27-2003, 10:43 AM
 
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Re: Alternator questions

I see two drawbacks to the one wire alternator:

1) Self exciting - But at what RPM? Will you have to rev the motor up to 2500 rpms before it excites and begins charging. I'm not saying it wont charge at idle. It's just that you have to rev it to a threshold rpm before it comes to life.

2) Being internally regulated you can't do the TR modification and attach the sense wire to your wiring harnes to sense and compensate for load. Whatever voltage it regulates at, say 13.8-14.2 volts, it will regulate to that voltage internally. It won't know or care if voltage is lower than that external to itself. If your fusable link plus wiring harness drops voltage, it won't sense it. Neither will an 80's stock alternator, but if you wire the sense line to key on power it will.
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post #7 of (permalink) Old 02-27-2003, 10:50 AM
 
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Re: Alternator questions

Thanks Drury,
I am about to put a newer stereo in, and I am sure that i might need to upgrade if I ever get money for the lights and winch I want. I will put that one in my Jeep file. Thanks

Cecil
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post #8 of (permalink) Old 02-27-2003, 11:49 AM
 
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Re: Alternator questions

Last summer I upgraded my charging system from a 1 wire alternator to an internally regulated 140 amp
alternator from Wrangler Power Products. Thats made a big difference in how well my electrical system
works. I also added some extra grounds and I can tell my system as a whole is much healthier. Before, I
always had a slow starting problem, That is the starter turned very slow. It would start, But you could
tell it was laboring to do so. I was told by the Wrangler tech that the problem with 1 wire systems is
that they don`t start charging until your motor is turning 2000-2500 RPM. So unless your up to that RPM
for an extended time period, Your system isn`t being charged adaquatly. I know for a fact that what he
said was true for me. I`ve had no problems since I got rid of the 1 wire system. A 1 wire system may be
OK for for a low amp draw situation, But if your running any accessories,(Extra lights,winch, daul batteries,
etc.), Your better off staying away from them. Don`t take my word for it, Call Wrangler. They`ve always
been helpful when I`ve called with questions.
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post #9 of (permalink) Old 02-27-2003, 11:57 AM
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Re: Alternator questions

The problem with the 1 wire alternators, or even using the
"cheat" method of running a wire from the regulator sense
terminal to the output, is the alternator isn't monitoring
anything but itself.
The battery won't fully charge.
You can even throw the battery across the street and the
alternator/regulator will never know it.

It's kinda like asking a politician if he's honest - you know
what he'll say.

The best way is to have the voltage regulator sense the voltage
directly at the battery (+) terminal through a separate wire
(called a Kelvin lead) so it's not affected by voltage drops.
The load pulls from the battery, so let that be the place to
watch. If you look at a GM wiring diagram you'll see that's
where they sense it.
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post #10 of (permalink) Old 02-27-2003, 12:17 PM
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Re: Alternator questions

Please excuse my ignorance, can you describe what a Kelvin lead is? I did a search on Google and all they show is test leads for multimeters.
Thanks,

GM
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