Join Date: Jul 2009
Bronco Info: 90' 351/E40D 38" tires, 4.88 gears, full float 8.8, lockers F&R
Interesting idea. My understanding of a alternator is that it senses the bat volts and puts a charge on if needed. So if you wire two in parallel and there was enough draw to exceed one alternator, I'm sure it would work fine. The question I have would be, would they share the work?
For example, if one alternator was running and not to max output, the volts would be at aprox. 13.5. So if you connected a second alt, it would sense that voltage and determine that no charge is required.
Of course if both were hooked up from the start, maybe they would share. But maybe one would start charging a little before the other and the only time the second would come into play was when the first was exceeded. (and the voltage dropped)
I guess you could run two "one wire" altenators to two selinoids. Then you could pick which alternator you want to run that day (or both if needed)
My opinion would be that the only reason you would want two alts is for redundancy. If you want more power, get a bigger alternator.