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diagram for dual relays for dual fans


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78mc-bbc 
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Location: Rhode Island, United States
Posted: August 23, 2011 at 10:46 AM / IP Logged  
So i am trying to come up with an easy to follow diagram for adding a set of the intrepid fans to a car with a realy for each fan. After researching other's attempts at this online i came up with this below. Can someone more versed in wiring take a look and let me know if this looks like it will work???
PS. i need the two green and yellows going to each fan to operate at high, if you power the green or yellow singularly you only get low speed
diagram for dual relays for dual fans -- posted image.
howie ll 
Pot Metal - Posts: 16,466
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Posted: August 23, 2011 at 5:14 PM / IP Logged  
Are you trying to run both fans at once?
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
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Posted: August 23, 2011 at 5:29 PM / IP Logged  
Because it looks from that diagram that fan two will only work when fan one's relay isn't powered up. And you haven't shown any differential switching, in other words you will only get one fan at a time. If you want them both to work together, thus:-
cooling_fans.bmp
78mc-bbc 
Member - Posts: 14
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Posted: August 23, 2011 at 5:52 PM / IP Logged  
yes i am trying to run both fans at once, i dont need the ac activation since the car has no ac. i am trying to split the load from the two fans going on at once to the two relays
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
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Posted: August 23, 2011 at 6:05 PM / IP Logged  
If both at once, use my diagram, or better still use a single 80 amp relay with a 60 amp fuse, e.g. Google RAW components, also as a mod, make 86 IGNITION fed, running those two on a constant is going to murder your battery.
78mc-bbc 
Member - Posts: 14
Member spacespace
Joined: August 23, 2011
Location: Rhode Island, United States
Posted: August 23, 2011 at 6:15 PM / IP Logged  
so instead of 86 and 87 being tied together, keep 87 going to the battery and 86 to an ignition on location??
oh and thanks for the heads up on RAW they have alot of cool parts
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: August 23, 2011 at 6:22 PM / IP Logged  
Exactly. By the way, no air? Yuch.
Incidentally I also Googled Nagares but they appear to be a Swiss company.
Radio Spares, AKA RS components in the UK also stock their products. The US equivalents (I believe the same multinational) are Farnell and Mouser.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: August 23, 2011 at 6:43 PM / IP Logged  
Google Mouser; go to the US version, go to Automotive Relays, from about page 8, 50amps (though 70 is safer).
78mc-bbc 
Member - Posts: 14
Member spacespace
Joined: August 23, 2011
Location: Rhode Island, United States
Posted: August 23, 2011 at 6:51 PM / IP Logged  
thanks for the info and help
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: August 23, 2011 at 6:53 PM / IP Logged  
One more and possibly the best bet for you and a bloody good price, Newark Farnell, part # 30M 9206.
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