Underhood ignition "hot" wire

QDRHRSE

New Member

Dec 31, 2002

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Palmdale, CA

Aug 11, 2005

#1

• Aug 11, 2005

• #1

Where's the best place to get a positive wire that is hooked into the ignition? I usually just poke around under the dash, find a hot wire, turn the car on and off to see if it is constant or not, and then I tap into it. Sometimes that can take a while. Is there anything under the hood that I could use.....I don't know off hand.

 

J

j.speed

Founding Member

Feb 1, 2001

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Meriden, CT

Aug 11, 2005

#2

• Aug 11, 2005

• #2

If you are looking to use a power source that is on when the key is in the key on engine off position, I usually use the hot wire on the alternator. Or you could pick up a power source off one of the wires that come off the solenoid.

 

jrichker

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Mar 10, 2000

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Dublin GA

Aug 11, 2005

#3

• Aug 11, 2005

• #3

The ignition coil is hot when the switch is in the run position. Use the red/green wire to trigger a relay. Run a fused wire to the relay contacts and you can suck as much juice as your relay & wiring can carry. All this is possible without harming the ignition circuit.

 

T

THC420

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Dec 18, 2001

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Ontario, Canada

Aug 11, 2005

#4

• Aug 11, 2005

• #4

use the red wire on the coolant sensor that plugs into the overflow bottle. that is what i use for anything that needs 12V key on power to turn on a relay.

 

QDRHRSE

New Member

Dec 31, 2002

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Palmdale, CA

Aug 12, 2005

#5

• Aug 12, 2005

• #5

Perfect. I didn't want to use the coil wire (so I knew about that) but the other two ideas never even occured to me. The coolant sensor is perfect!!!!!

Thanks Guys