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fuel pump relay?


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hotstix 
Member - Posts: 4
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Joined: January 28, 2012
Location: California, United States
Posted: January 28, 2012 at 3:25 AM / IP Logged  
Hello all, Im a super noob here, so be kind.
Im installing an aftermrket fuel system in my car and have an issue with wiring.
Basically I have a terminal (switch) on the pump controller that needs a 12+v signal to turn on, and 0 to turn off.
My problem is the input signal I want to use for the controller is constantly putting out between 9v (low load) and 14v (high load).
So my question is: Is there a relay configuration that I can use to take that 9-14V wire and make it an on/off swtich that either is putting out 12+ volts or nothing?
Thanks.
i am an idiot 
Platinum - Posts: 13,465
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: January 28, 2012 at 3:46 AM / IP Logged  
Yes, a standard Tyco Single Pole Double Throw relay will do what you need.  Ground terminal 85, connect your 9 to 14 volt wire to terminal 86.  Terminal 87 should be connected to the battery via a fuse.  Terminal 30 will power your new fuel pump.
howie ll 
Pot Metal - Posts: 16,466
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Posted: January 28, 2012 at 10:22 AM / IP Logged  
Craig on your configuration wouldn't you need 87a to be connected to ground?
howie ll 
Pot Metal - Posts: 16,466
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Posted: January 28, 2012 at 10:25 AM / IP Logged  
It's just the poster's use of "0".
Poster, do you mean 0 volts as in "open circuit", i.e. nothing, or do you mean "0" as in ground?
I'm assuming the first case is correct and therefore so is Craig.
hotstix 
Member - Posts: 4
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Joined: January 28, 2012
Location: California, United States
Posted: January 28, 2012 at 11:56 AM / IP Logged  
howie ll wrote:
It's just the poster's use of "0".
Poster, do you mean 0 volts as in "open circuit", i.e. nothing, or do you mean "0" as in ground?
I'm assuming the first case is correct and therefore so is Craig.
Sorry for the confusion. Yes, by "0" I am referring to an open circuit.
If I wire the relay according to the first post, what will trigger the relay to close and output the 12v signal? The variable voltage input wire reaching a value ofe 12 or higher?
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: January 28, 2012 at 1:08 PM / IP Logged  
Yes, keep to Mr. Idiot's answer. Ave 12V+ Bosch/Tyco relay, the coil will act when the the voltage reaches about 7.5V+.
hotstix 
Member - Posts: 4
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Joined: January 28, 2012
Location: California, United States
Posted: January 28, 2012 at 2:42 PM / IP Logged  
howie ll wrote:
Yes, keep to Mr. Idiot's answer. Ave 12V+ Bosch/Tyco relay, the coil will act when the the voltage reaches about 7.5V+.
But the input voltage to the relay will always be 9v minimum. So does that mean the coil will ne constantly triggered?
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
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Posted: January 28, 2012 at 6:30 PM / IP Logged  
Maybe a 1K resistor on the trigger wire or sub a 24volt relay just to see.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: January 28, 2012 at 6:39 PM / IP Logged  
Or a few diodes to predictably drop the voltage.
Maybe a zenor diode if a high drop is needed.
hotstix 
Member - Posts: 4
Member spacespace
Joined: January 28, 2012
Location: California, United States
Posted: January 28, 2012 at 8:04 PM / IP Logged  
At what voltage will the coil actuate on a 24v relay?
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