Sounds like the motor on the second fan is putting too much load on the alternator. If you look on the Flex-a-lite web site at their fans some of them can draw upwards of 10 amps all the way to nearly 30 amps. If you've got a typical automotive alternator it's probably only putting out 35 to 40 amps. Most blower fans don't draw that many amps so you wouldn't see a big difference with just one cooling fan running, the heater blower and any other small accessories. Even headlights don't typically draw a huge amount in relation to a cooling fan. So with both fans running, along with any other normal draw, it's probably close to maxing out the alternators output. That would account for the low voltage with everything running. The first thing I'd do would be to take the alternator and have it checked out. If it's not rated at at least 40 amps I'd check into one with a higher output. Too the alternator may not be completely dead but the brushes may be worn to the point that the output is being reduced. I had a truck years ago that did something similar when the brushes got down close to being gone and the resulting spring tension on them was severaly low. The lights would dim, the wipers were slow, etc right up until the end when it quit putting out completely, the battery died, and everything died...while I was out of town in a heavy rain...
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