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the12volt's install bay
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hotstix
Joined: January 28, 2012
Location:
California,
United States
Posts: 4 |
| Posted: January 28, 2012 at 3:25 AM - IP Logged |
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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. |
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i am an idiot
Joined: September 21, 2006
Location:
Louisiana,
United States
Posts: 10,454 |
| Posted: January 28, 2012 at 3:46 AM - IP Logged |
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| 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. |
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howie ll
Joined: January 09, 2007
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Posts: 9,717 |
| Posted: January 28, 2012 at 10:22 AM - IP Logged |
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Craig on your configuration wouldn't you need 87a to be connected to ground?
___________________________________
Amateurs assume, don't test and have problems; pros test first.
Read the installation manual, do a search here for your vehicle wiring. |
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howie ll
Joined: January 09, 2007
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Posts: 9,717 |
| Posted: January 28, 2012 at 10:25 AM - IP Logged |
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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.
___________________________________
Amateurs assume, don't test and have problems; pros test first.
Read the installation manual, do a search here for your vehicle wiring. |
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hotstix
Joined: January 28, 2012
Location:
California,
United States
Posts: 4 |
| Posted: January 28, 2012 at 11:56 AM - IP Logged |
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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. |
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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? |
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howie ll
Joined: January 09, 2007
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Posts: 9,717 |
| Posted: January 28, 2012 at 1:08 PM - IP Logged |
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Yes, keep to Mr. Idiot's answer. Ave 12V+ Bosch/Tyco relay, the coil will act when the the voltage reaches about 7.5V+.
___________________________________
Amateurs assume, don't test and have problems; pros test first.
Read the installation manual, do a search here for your vehicle wiring. |
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hotstix
Joined: January 28, 2012
Location:
California,
United States
Posts: 4 |
| Posted: January 28, 2012 at 2:42 PM - IP Logged |
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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+. |
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But the input voltage to the relay will always be 9v minimum. So does that mean the coil will ne constantly triggered? |
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howie ll
Joined: January 09, 2007
Location:
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Posts: 9,717 |
| Posted: January 28, 2012 at 6:30 PM - IP Logged |
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Maybe a 1K resistor on the trigger wire or sub a 24volt relay just to see.
___________________________________
Amateurs assume, don't test and have problems; pros test first.
Read the installation manual, do a search here for your vehicle wiring. |
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oldspark
Joined: November 03, 2008
Location:
Australia
Posts: 2,856 |
| Posted: January 28, 2012 at 6:39 PM - IP Logged |
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Or a few diodes to predictably drop the voltage.
Maybe a zenor diode if a high drop is needed. |
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hotstix
Joined: January 28, 2012
Location:
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Posts: 4 |
| Posted: January 28, 2012 at 8:04 PM - IP Logged |
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| At what voltage will the coil actuate on a 24v relay? |
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Topic: fuel pump relay?
