Electric Fans

[Brandon]

Hey Guys,
Recently I've added a second electric fan so I'm running 2 Flex-A-lite S-Blades and have noticed a decrease in the speed and power of the fans since adding the second one as well as my ability to blow through a fuse has increased.
The instructions say to use a 20 amp fuse for one but I kept blowing it last year and upgraded to a 30amp with no issue. Just took it for a run and blew the 30amp with my 2 fans.

Here is how my fans are currently wired.


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Any suggestions or ideas as to my issue with lack of power and fuse blowing? I've checked the line for shorts and couldn't find anything.

 

[nycutlass]

the way i see your diagram it will not work correct . my picture shows a basic parallel circuit i would also run 2 relays or one 40 amp relay for both fans and the fans neutral being grounded out to the chassis . use the t-stat on the neutral side of the relay and the 12v side of the relay on key on/off side of fuse block . so in a nut shell the t-stat is your switch turning the fans on and off .if you still not sure i can draw you up one in detail

 

[Longroof79]

I was also going to suggest running one relay per fan. Theoretically that should take care of your fuse blowing issue.

 

[Brandon]

the way i see your diagram it will not work correct . my picture shows a basic parallel circuit i would also run 2 relays or one 40 amp relay for both fans and the fans neutral being grounded out to the chassis . use the t-stat on the neutral side of the relay and the 12v side of the relay on key on/off side of fuse block . so in a nut shell the t-stat is your switch turning the fans on and off .if you still not sure i can draw you up one in detail

So.. jsut to clarify.
I should get a 40 amp fuse, Then connect both my fans directly to the t-stat?

I think I may need that picture

 

[nycutlass]

ok ill draw you a picture ...how many amps does each fan draw (load) then i can tell you what relay you need .if it was me i would run 2 relays just in case one fails you still have another circuit working and able to cool the car down .

 

[Brandon]

The amp draw is 9.2. Thanks a ton

 

[nycutlass]

hows that for you ?.....this drawing is based on a total of 18.4 amps of load . 9.2 amps each as you said befor. if u want 2 relays just split the fans up and run two 20amp relays .i also drew up a over ride if the t-stat fails at any point.always run a relay on any heavy load items you run in the car if you didnt know already.

 

[Brandon]

Thanks man, And no I didn't know about the relay.
I'll make a visit to the store tomorrow for one and get to rewireing them.

 

[nycutlass]

Thanks man, And no I didn't know about the relay.
I'll make a visit to the store tomorrow for one and get to rewireing them.

np .... just in case u have a hard time finding a relay here is a link of one ...
http://www.summitracing.com/parts/VIA-80237/

 

[Brandon]

Thanks, I''ll go hunting at a couple of the local part stores for one