I have had my Black Magic 3300CFM E-fan installed for a couple years now and I have always noticed that at idle when the fan comes on the engine will bog down a couple hundred RPMs for a quick second and once the fan is going its fine.

Does this mean when the fan engages it draws enough amperage (19.0amps) to effect the spark from the coil pack? If a bigger battery is the fix, how big without straining the alternator ,which is factory?

 

How big are the relays you are using?

 

No relays the fan is wired hot to the battery with a 30amp fuse on the hot side.

 

always run relays! Its cheap, easy, and will save your electrical junk. I would never hot wire to a battery...they are expensive..why take the chance to hurt it?

 

This is a fire waiting to happen. You need at least 2 relays one for HIGH and one for LOW.

 

I figured the two prong 30amp inline fuse for the power wire the install kit came with would be enough. I know it works because i clogged it up with mud last year (mud race) and it blew the fuse and saved the fan. But is the 19amp draw too much for the battery?

 

Do you have a temperature control kit with the relay and all that? How does your fan know when to switch on and off? Please provide us pics so we can tell you how wrong it is, and how to do it right :)

 

When the fan turns on, the voltage regulator calls for more voltage from the alternator. Alternator ramps up, that is what your feeling

 

Here is how it is wired. Dark Red is power wire with 30amp inline fuse. Pink is for optional key ignition wire/second power wire. Black is ground. The other pink wire is for my emergency light bar. I know it requires more voltage but why is it drawing so much that it bring the engine rpms down. The fan is thermostat controlled and I have set it to turn on @ 185 degrees. The battery is rater for 610 CCA and 784CA which should be plenty big.

 

Pics are in "Blackmagic 3300 CFM E-Fan" album on my profile. as well as here