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12V Ignition Source In Engine Bay Area

SMOKEYV35
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SMOKEYV35 Mentor

SMOKEYV35

Posted
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hey guys, have fitted up some DRL's - they look awesome, but i need to find a 12V source that is only on when the car is running - but ideally i want to tap this into somewhere in the engine bay to save having to run more wiring into the cabin. any suggestions??

car is an S2 RS4S.

cheers, mat

AAA34T Community Regular

AAA34T

Posted
Posted

hey guys, have fitted up some DRL's - they look awesome, but i need to find a 12V source that is only on when the car is running - but ideally i want to tap this into somewhere in the engine bay to save having to run more wiring into the cabin. any suggestions??

car is an S2 RS4S.

cheers, mat

there is an ignition wires in the fuse panel under the bonnett well there is heaps in my rs4

SMOKEYV35 Mentor

SMOKEYV35

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in the fuse box on the drivers side behind the battery? whole heap of fuses and relays - but no wiring. how can i splice in?

other suggestion has been alternator - but i'd be a bit hesitant tapping in there in case the alternator overcharged and blew up my expensive DRL's!

AAA34T Community Regular

AAA34T

Posted
Posted

in the fuse box on the drivers side behind the battery? whole heap of fuses and relays - but no wiring. how can i splice in?

other suggestion has been alternator - but i'd be a bit hesitant tapping in there in case the alternator overcharged and blew up my expensive DRL's!

[/quo

in the fuse box the relay section unclips and comes up then all the wiring is easy to get to i hid most of my electrical parts under the relays

  • 3 weeks later...
SMOKEYV35 Mentor

SMOKEYV35

Posted
  • Author
Posted

just getting round to this.

got the fuse box up.

found a 12v feed when ign on, but i can't make out which wires go to which fuses. anyone got a wiring diagram for this section of the car?

66yostagea Grand Master

66yostagea

Posted
Posted

It is difficult to find a source that only comes on when the ignition is on. In the "good ole days" the pos to the coil was the place to go, but with todays build it is difficult. When I fitted the gauges, to get feed for the illumination, I tapped into the power feed to the stereo. That only comes on when the ign is on, or at least on Acc. I also put a switch in to turn lights on or off.Similarly I had another switch that allowed for earthing the boost solenoid to give stock boost, or run on max stock boost all the time. I now run MBC..

SMOKEYV35 Mentor

SMOKEYV35

Posted
  • Author
Posted

I can find ignition in the cabin easily, but I'm trying to avoid having to run more wiring in there for that. There has to be a way to pick up 12v ignition in the engine bay....... I mean, the engine doesn't run without it?!

SMOKEYV35 Mentor

SMOKEYV35

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haha so what about when VCT kicks in? will that mean my lights go off!?

think i might just route it through the fire wall. not keen on tapping anything that might have a varying voltage etc - these lights are exp - don't want them ruined by my laziness.

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

haha so what about when VCT kicks in? will that mean my lights go off!?

think i might just route it through the fire wall. not keen on tapping anything that might have a varying voltage etc - these lights are exp - don't want them ruined by my laziness.

No the supply will be constant 12v only the vct is switched on and off through the earth side. If you are really worried about your lights you can take power from the battery and just use the vct power supply to trigger a relay (but check first to see if the vct power supply is ignition controlled - haven't got my car here to check atm).

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