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Inside Fuse source for 12V constant

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Old Jul 25, 2003, 07:42 AM
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Inside Fuse source for 12V constant

I'm trying to find a fuse in the fusebox on the inside of the car that will provide a 12v constant (always on even if ignition is off). I would rather not have to try to pass through the firewall to get to the fuses under the hood if I can avoid it.

I tested and the cigarette lighter is not on with the key out/off.

There are empty slots and something labeled engine control but I don't know what they do.

Anyone know of anything on the inside fuse box I can use?
Old Jul 25, 2003, 05:14 PM
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why dont you use the radio wires instead. that's what i did to connect my radar detector.
Old Jul 25, 2003, 05:18 PM
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I'm not sure I can identify what radio wire is constant 12V? I ran my radar detector to the fuse for cruise control....

I'm hoping the dome light fuse will work...
Old Jul 25, 2003, 05:40 PM
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wait are u trying 2 wire something like a amp power wire? or what
Old Jul 25, 2003, 06:15 PM
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No just a fake alarm light
Old Jul 25, 2003, 06:19 PM
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1 ground wire, 1 12v-constant on, 1 12v on with ignition...
Old Jul 25, 2003, 07:50 PM
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high beams should have ocnstant power all the time.
hazzard light
horn
brake light
Old Jul 25, 2003, 07:56 PM
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i believe there is a constant in the radio wires
Old Jul 26, 2003, 06:04 AM
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Thanks....I'm looking for sources on the inside fuse box. The horn, hazzards, brake lights... are under the hood fuses.

The radio may be a possibility of the dome light fuse doesn't work out but I'm not sure what radio wire and I'd rather tap a fuse and not mess with the factory wires in case I have to remove it.
Old Jul 27, 2003, 09:15 AM
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bumpppppppp
Old Jul 31, 2003, 12:53 PM
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anybody figure it out yet?
Old Jul 31, 2003, 01:03 PM
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Definately a constant in the radio wires. My jvc head unit is powered without a key.
Old Jul 31, 2003, 01:04 PM
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Just test the pins in the fuse box with a volt meter with the key off if you didn't try that allready.......... You'll also want to put an in-line fuse to the light so you don't run too many amps into it, the light should be rate. It should prolly only need 1-2 Amps......

Also there are two power wires that run to the radio, the Battery wire and memory wire, test them and see which one has power with the key off and use that one, don't forget about the fuse...

Last edited by Future EVO-R; Jul 31, 2003 at 01:07 PM.
Old Jul 31, 2003, 01:14 PM
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I'm hoping to run off an interior fuse and I'd rather hit the underhood fuses before I'd tap a radio wire...
Old Jul 31, 2003, 01:42 PM
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this may help:


its the diagram that came with my wiring harness...
Attached Thumbnails Inside Fuse source for 12V constant-radio-wiring-diagram.jpg  


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