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Re: altenator size
[Re: dodgedart416]
#123499
09/20/08 01:20 PM
09/20/08 01:20 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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I think 80+ Amps, but you need it to putout a large percentage of the rated current at low RPM. This can be done by changing the crank/alternator pulley ratio. When choosing the pulley ratios you want to make sure ther alternator is not over reved at peak engine RPM. This is one reason I like the newer Denso alternators usen on most of the new Mopars. The Denso alternators are rated to 14,000 RPM, so even with a 2:1 pulley ratio you should be good unless the engine normally revs way over 7,000+ RPM. You will also have to upgrade the wiring. As a minimum run a 10-AWG (or larger)wire from the alternator output to the battery (should go through a fuseable link too)while also connecting the stock alternator output wires. The new wire will create a parallel circuit to the battery, but will have lower resistance so it will carry more of the current than the stock wiring. The only problem is the stock alternator gauge will not move as much so you should add a voltage gauge to monitor the charging system. The stock electronic '71 and up voltage regulator should work fine to control the alternator, but you will need the plug-in connector for the alternator.
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Re: altenator size
[Re: 64Belvedere]
#123501
09/20/08 04:02 PM
09/20/08 04:02 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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I would suggest at least 100 amp peak output. THis should ensure enough output at low speed.
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Re: altenator size
[Re: dodgedart416]
#123503
09/20/08 10:06 PM
09/20/08 10:06 PM
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Joined: Sep 2003
Posts: 161 ohio
dodgedart416
OP
member
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OP
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Joined: Sep 2003
Posts: 161
ohio
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I do have everything on relays and do have voltage gauge.
Last edited by dodgedart416; 09/20/08 10:09 PM.
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Re: altenator size
[Re: dodgedart416]
#123504
09/20/08 10:55 PM
09/20/08 10:55 PM
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Joined: Jun 2003
Posts: 845 Kansas
64Belvedere
super street
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super street
Joined: Jun 2003
Posts: 845
Kansas
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Quote:
So if I get alt for let say an 89 dodge truck do I need voltage regulator from same truck? Also when I run "charge wire" it comes from "charge" post on alt to positive post on battery and use at least a 10 awg wire right? Thanks
I think the '89 application would work, but no promises. A little research on Autozone.com or one of those places should tell you what alternators are available for that application. I think I used a '90 or '91 D150 application to get an alternator at the salvage yard for mock up purposes.
Your voltage regulator will work fine. Although, if you still run a mechanical regulator, I'd swap it for one of the solid state ones that are sold as replacement parts these days. If you have an early model mopar that runs a single field wire to the alternator, you'll have to ground the other field terminal to the case on the alternator. If you have the modern dual-field regulator setup, you'll have two wires that plug into the two field terminals on the alternator. The 10 AWG wire is what I'm running at the moment as an additional "charge" wire. A little bigger (if you can find it) isn't a bad thing though. I ran mine to the positive terminal on the starter relay for convenience, but running it directly to the positive post on the battery should work too.
Again, doing a little research on this forum will reveal more info that will be useful on this swap. Particularly with the mounts. I believe longer, or shorter spacers have to be used to line everything up. Goody on this forum has a pretty good writeup on his swap.
http://www.goodysgotacuda.com/HowTo.html
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