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switched +12V tap

Trying to install a water injection system. Instructions call for tapping into a +12V line switched on with the ignition. Need a suggestion for a good easy to get to line or terminal under the hood where I can do that? Lame question I know but I'm tired and drawing a complete blank right now. Thanks.
Mike R.
 

powerplay

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Mike, follow the wire down from the "On" position of the ignition switch. You can see several wires at the fuse block where you can tap your line.
 

I used the fuelpump test wire on the firewall to pull a relay in that turned the power on to my WI pump. /ubbthreads/images/graemlins/wink.gif
 

CP

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^^^Which one is THAT? I acidentally tapped the yellow wire to the radi oand it is aparently constant power. My batt and gauge don't like that.
 

I actually ended up tapping off the hot side of an empty fuse slot in the underdash fusebox.
Mike R.
 

CP

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I'm already doing that for my WBO2 unit and V1 /ubbthreads/images/graemlins/grin.gif I don't think I've got any extra empty fuse slots.
 

CP

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Is it the blue one (from the car) w/ the white dots on it?





I had tapped into the yellow wire in the middle harness (w/ the blue wire nut) and it was constant batt power, so my coolant temp gauge was active when the car was turned off...doh.
 

Quote:
I'm already doing that for my WBO2 unit and V1 I don't think I've got any extra empty fuse slots.




What's a V1?
You might be able to make a lead off the fuse slot with multiple pigtails that could support several items if they don't draw a lot of current.
Mike R.
 

CP

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Radar detector...Valentine One.

Any tips about the blue wire?
 
Last edited:

Gordian79

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I have a similar question.Is there any switched 12v near the battery i need to wire up my fans.maybe in the pass fuse box?
 

Gordian79

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Its a whole big mess thats why im using the painless wiring relay kit.maybe i can use the abs fuse since i dont have them anymore.is that circuit switched?
 

CP

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^^^^Ooo, good idea: the ABS fuse...but isn't that in the engine compt fuse block?
 

Gordian79

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^^^^yea it is.I want to keep the wire runs to a minimum so that would be a good spot for fan relay.
 

CP

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So, back to that blue wire behind the radio...?
 
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