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Ignition 1 or 2 for Aftermarket Fan Relay?


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jnz01 
Member - Posts: 7
Member spacespace
Joined: December 31, 2009
Location: Wisconsin, United States
Posted: May 09, 2010 at 2:21 PM / IP Logged  
I am wiring in an aftermarket fan relay what wire should I tap ignition 1 or 2. The car is a 1998 Mitsubishi Eclipse.
What is the difference between the two.
t&t tech 
Platinum - Posts: 2,608
Platinum spacespace
Joined: October 05, 2008
Location: Trinidad and Tobago
Posted: May 09, 2010 at 3:49 PM / IP Logged  

Ignition 1 i guess! Although it makes no real difference! The difference between the two is

Ignition 1- Shows 12 at the on, crank and running positon!

Ignition 2 - Shows 12 at the on position but drops out during crank!

commit your way to jehovah and he will act in your behalf. psalms 37:5
phil6710 
Copper - Posts: 89
Copper spacespace
Joined: September 04, 2009
Location: New York, United States
Posted: May 09, 2010 at 4:54 PM / IP Logged  
Ingnition one and two should test the same. They should test 12v  on, 12v on durring crank and 12v in the run position. Accesory wirers ussualy will test "off" durring crank. Your 98 eclipse does not have an ingition 2. Only an ing 1, acc, and start.  Your best bet would be to connect to ing 1 which is BLACK/ white. Be sure to fuse the circut to the fan relay.
KPierson 
Platinum - Posts: 3,527
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: May 09, 2010 at 8:28 PM / IP Logged  
I would run it to the ACC so the load drops out during cranking.
Kevin Pierson
i am an idiot 
Platinum - Posts: 13,693
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: May 09, 2010 at 8:50 PM / IP Logged  
I am with Kevin on this one.  A fan draws twice as much current at startup than it does once it is turning.  If a car has multiple ignition wires, they all act the same.  The ignition wire is hot with key on and also in the start position.  Accessory wire drops out during start.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: May 09, 2010 at 9:09 PM / IP Logged  
Ditto!!
But only twice inrush? I though MUCH higher albeit for a short time (transient).
But with the smallest fans being about 10A and some being 50A, 100A etc total - and since they do not help with starting - the should be off during cranking.
(FYI - I used to help "fire" my car by turning the fan on. It was not coincidental - the transient gave the extra kick to the Ig coil. LOL!)
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: May 10, 2010 at 9:02 AM / IP Logged  
Only 1 ignition that stays live (hot) during cranking, use a (fused) relay from the battery and trigger it from the ACC, it's safer, bloody great start-up onrush current from fans.
Alternatively, a latching relay from engine run, even safer!
nismo542 
Copper - Posts: 62
Copper spacespace
Joined: June 04, 2010
Location: South Carolina, United States
Posted: June 06, 2010 at 2:07 AM / IP Logged  
i would use a realy with acc as the trigger and run dedicated power from the battery through the relay.  also fuse the relay, this will be the safest.

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