View Single Post
Old 05-11-2021, 09:24 PM   #16 (permalink)
EcoCivic
Master EcoModder
 
Join Date: Jul 2017
Location: Memphis, Tn
Posts: 427
Thanks: 293
Thanked 92 Times in 71 Posts
I was finally able to get a measurement. At idle with the alternator off, I see a draw of about 16 amps for both fans. At 70 MPH I see a draw of about 9 amps from the fans and there is definitely a spike in current draw when they start up, but there appears to be less of a spike than when idling. This seems to indicate that the fans do spin while driving down the highway, but at less than full speed. Not sure how the alternator being on affects this yet, but there are definitely power savings to be had from shutting the fans off on the highway. Although the reduction in alternator drag would be impossible to see on my MPG by itself, it will significantly save my battery when driving around with the alternator off and possibly extend the life of my alternator as well since it won't be working as hard.
  Reply With Quote
The Following User Says Thank You to EcoCivic For This Useful Post:
redpoint5 (05-11-2021)