Trouble locating a proper wire

I need to locate a wire that reads +12V when the key is in both the ACCESSORY and RUN positions but also NOT interrupted when the starter cranks. I have tried my ACC, IGN1, IGN2, and IGN3 wires and none of them give me what I need. My IGN2 is not interrupted when the starter cranks however it has no power in ACC. I own a 2001 S10 Blazer. Any ideas?

12V                       |red                 |+  |ignition harness           
STARTER          |yellow              |+  |ignition harness           
IGNITION         |pink                    |+  |ignition harness           
SECOND IGNITION|white       |+  |ignition harness           
ACCESSORY|orange         |+  |ignition harness           


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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

What purpose will that wire serve once you have found it? It would help to know so that we can think of alternative ways to accomplich what you want to.

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J Rilla

Owner/Installer

You will not find a single wire that does what you want. Only possibility is to use both an accessory wire and ignition wire to trigger a relay.   Wire it as follows:

Ignition --->     -----------|--            -------->    86
Accessory ----)      -----------|--     -------->    86
Ground ----------->   85
Fused Constant +12 -------> 87
To device you are powering -------> 30


the ---------|-- are diodes. The stripe side goes toward the relay.
Hope you understand my explanation

There is one wire that will do what you want it to do, the main power wire at your ignition harness. It is on in the acc and start position.

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Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

"There is one wire that will do what you want it to do, the main power wire at your ignition harness. It is on in the acc and start position."

Not the brown...not the orange...not the pink....not the white....anything left???

Thanks for all the quick responses guys. I'll check out your suggestions right away. JWorm's idea with the relay will solve the problem which I'll use as a last resort if I can't locate a single wire to do the trick. I just got some data from AllData that should also help me.

Auex is right, the only wire that will do that is a 12v+ constant wire. But it sounds like you dont want power when the car is OFF, so you will need to use an alternate method to create the effect you want. If you use JWorms method, you need to make sure you isolate the Accessory wire from the Ignition wire with some heavy duty diodes. That is unless you use 2 relays, with the Accessory wire triggering one, and the Ignition wire triggering the other.

Like I mentioned before: Let us know what you are trying to accomplish and we will be able to help you better.

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J Rilla

Owner/Installer

What, nobody picks up on the sarcasm?

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Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

JRILLA you are correct. I don't want +12V when the car is off.

What I need this for is as follows. I have a small circuit module that I built (couple of relays, resistor, capacitor, mounted of a piece of circuitboard) which is wired to the power switch of an LCD. The module shorts the LCD switch (i.e. turns the LCD on) when the ignition is turned on. The resistor and capacitor on the circuit are used with the 1st relay as a timer to delay the switch pulse from the 2nd relay a second or two (because if I pulse the switch at the same time the unit gets power it won't turn on, but it does if I delay it). If I start the vehicle normally everything works fine. However if I turn the key forward to run and then wait a second, the LCD will turn on, but then it will go off when I crank the motor because the +12V is interrupted. The module will not pulse the switch again in this case because the capacitor did not have enough time to discharge. I could solve all of this if I could find a wire with +12V in IGN and ACC but not interrupted when cranking (i.e. it would not lose power during start so it would stay on). That is why I was looking for a wire of this nature.

couldn't you just run a wire direct from the battery to acheive the constant power?

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Quad L Handyman services