Author Topic: Using the Denso Alternator from Magnum motors  (Read 803 times)

Offline EFI-Cuda

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  • 1974 Cuda 408
Using the Denso Alternator from Magnum motors
« on: October 27, 2005 - 01:34:06 AM »
My Cuda has out grown the factory alternator which was barely adequate for the Cuda in the first place.   The additions of power windows, stereo amplifiers and an electric fuel pump have been enough to make the factory alternator obsolete.   

Since I want to switch to a serpentine belt set up for my engines accessories anyway, I am planning to use the accessories from the Magnum engines.  Included in this, is the Magnum engine's Denso alternator.  I have found a little information about using this alternator on the internet, but I still have questions and would like the input from anyone that has used this alternator on their older Mopar.

1.)  Can the factory wiring handle the amps of the higher output alternator?
2.)  Is adding a 4 guage wire necessary.
2.)  Will the factory voltage regulator work with this alternator, or is a different voltage regulator necessary.

Any input on the use of this alternator is helpful and appreciated.
Cuda 408, Ford EFI, Magnum heads, Vortech V-2 Si-Trim, A-518 transmission and 3.23 gears.




Offline ntstlgl1970

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Re: Using the Denso Alternator from Magnum motors
« Reply #1 on: October 28, 2005 - 05:36:48 PM »
There is a related thread here:
http://www.cuda-challenger.com/cc/index.php?topic=13536.0

The factory wiring cannot handle the current of a 70A or higher alternator
A 4 gauge wire would work but is total overkill
The later model alternators have the regulator built into the computer (SBEC, SMEC, NGC etc.) Chrysler doesn't provide a whole lot of information about the regulator circuit as far as how many amps it can handle. If the resistance of the rotor is the same or close to what an older style alternator rotor measures then the regular external regulator should work fine. The electrical circuit for the field winding is exactly the same on the newer stuff as on the older stuff (the computer or the regulator controls the ground). The rotor on my alternator measures about 43 ohms through the brushes.
These alternators are used on all sorts of cars and minivans not just magnum engines. I went to my local wrecking yard last week and found a couple already loose or pulled from vehicles - cool, no time spent pulling the alternator. I thought about going with this alternator but I want to eliminate the external regulator altogether so I picked up a 3G from a lincoln town car, the 3G is shallower than the ND one but a little bigger in diameter.
70 Cuda, 7.0L Gen-III Hemi, Viper T56 w/9310 gearset, 3.91's, Megasquirt MS3x v3.57, Innovate wideband, Firm Feel upper arms, torsion bars, springs and strut rods, QA1 DA shocks. I did everything on this car except the fancy paint stuff and I drive it...and I can't seem to stop messing with it....