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12V ignition source

DB83

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Anyone know a 12v power source in the engine bay from ignition?

I need to power something in the engine bay to come on only with the ignition on.

Thanks!
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Anyone?
 

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Depends where you'd like to tap it. You could use a bussman add-a-circuit (amazon or local parts store will have them) to connect to fuse box directly, or you could tap a factory connector. The C175E connector on the PCM (95 pin, upper connector on PCM), has a blue wire on pin# 18 that is 12V switched source.
 
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Yeah, unfortunately here in spain we don't have that sort of stuff readily available so it's going to be a few days before i get any of that. Might just have to order one of those bussman's and wait on it. But yes, ideally i would like to feed it from the fuse box.

Do you know what fuse is ignition/switched?
 

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Yeah, unfortunately here in spain we don't have that sort of stuff readily available so it's going to be a few days before i get any of that. Might just have to order one of those bussman's and wait on it. But yes, ideally i would like to feed it from the fuse box.

Do you know what fuse is ignition/switched?
Any spare slots will likely be hot at all times, but you could test with a multimeter if you have one. I can help you pick a connector and wire to tap for switched 12V, just need to know:

- what are you using it for (current draw)?
- location in engine compartment that would be convenient? I can use this to select a connector/wire that would work for you.
 

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Its to run the diode dynamics DRL boards, which with european model cars can't be tapped in to the existing DRL's because the flicker, so the current draw is going to be very minimal.
I've got the LED drivers mounted on the passenger side of the engine compartment so the passenger side would be ideal!
 

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Its to run the diode dynamics DRL boards, which with european model cars can't be tapped in to the existing DRL's because the flicker, so the current draw is going to be very minimal.
I've got the LED drivers mounted on the passenger side of the engine compartment so the passenger side would be ideal!
If you choose to use the add-a-fuse then F20 (7.5A) in the picture below shows as unused in the wiring diagrams and is switched 12V (the fuse is off a Run/Start relay).

Your other option is to use connector C1044 (picture attached, passengers side headlamp power). The Gray w/ Violet stripe is hot in run or start.
battery box.webp
C1044.webp
 

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I believe in the fuse box pic above, fuses 37 to 45 and 60 to 68 are active only when start button has been pushed. I used 44 for a switched power on source for my nitrous switch.
Easy enough to check, voltmeter - ground the neg lead and put the pos lead in the top of the fuse (little opening for testing). If 0 volts good, push start button, should now have 12+ volts.
 
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Thanks for the help guys!!!!
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