Join Date: Jun 2012
Location: Southeast Michigan
Rep Power: 48628042
So the way a dual alternator system "with a single battery" would work is like this...
Whichever alternator has a higher voltage set point will become the primary alternator.
200 amp alternator supplying 14v
100 amp alternator supplying 14.8v
The 100 amp would be the primary due to higher voltage set point by the regulator.
Now under load the primary alternator will supply voltage. Once enough load has been placed on the system, the primary alternator voltage will begin to drop. Once this dropping voltage reaches the secondary alternator voltage set point, the secondary alternator will begin to supply voltage.
So basically, one alternator will be free wheeling until demand is needed. When alternators free wheel they have little rotational load on the drive belt system.
Stock 4g alternator will be wired factory. Second (denso) alternator will be a one-wire on/off design.
Pretty sure the Denso in this scenario will become the primary alternator as the stock 4g regulator has a set point of 14.4v.
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Last edited by Painless Autoworks; 04-24-2019 at 08:55 PM.