The voltage drop you see is past the battery and the alternator. The ignition switch, and the under dash wiring cause it. Mine has been doing that for 16 years.

As far as the electrics go, I found that at low speeds I could get full airflow. Unlike the mechanical setup that at idle in gear it did not move a lot of air.

The dual 1650 CFM fans work OK in traffic. I think a shroud would help a lot. Also the combo of an auto and a turbo is harder to cool. I dont think a single 12" fan is enough for a stock motor for hot weather.

I have had my fans for seven years and they seem to be struggling a bit. The radiator may be part of it, its about 10 or 11 years old.

Not totally sold that what I have was worth it. I was looking for better cooling at very low speeds, that I did get. I either need to add a shroud or do some radiator work for long slow traffic. This summer I was caught in traffic when it was 90? for an hour a day. The temp gauge was getting past the half way mark.

I plan of having that fixed up by next summer. Still, the dual 1650 CFM electrics was better than the factory clutch fan. Mostly I did this to keep a turbo motor cool when going very slowly. The combo of auto and turbo does take a bit to cool. My clutch fan didnt cut it at all.

The gain of the electrics is when not needed, there is no parasitic drag. Not a huge gain, but it helps.

Kevin