Welcome to PriusChat

We'd love to have you join our community and participate in the conversation! Sign up for FREE today.

Sign Up
  1. TGB4 2014 Prius Convention Hotel Discounts are ending this week. Click for more information. All Access registration with personalized items ends Sept 1. Register now!

Need 12V IGN or ACC wire in the engine bay

Discussion in 'Gen III 2010+ Prius Technical Discussion' started by robby3, Jun 12, 2011.

Social Buttons

  1. robby3

    robby3 Member

    Joined:
    Mar 25, 2011
    Messages:
    179
    Likes Received:
    22
    Location:
    Switzerland
    Your Vehicle Year:
    2010 Prius
    Model:
    V
    As the topic says, I do need a wire that is on 12V with IGN or ACC on. Our european cars do not have any DRL so there is no constant light on the fronts that I could use.

    Thanks in advance
    Rob
  2. spiderman

    spiderman wretched

    Joined:
    Jul 5, 2009
    Messages:
    7,390
    Likes Received:
    1,383
    Location:
    Alaska
    Your Vehicle Year:
    2010 Prius
    Model:
    II
    Looked for that myself a couple of times with no luck. I ran a wire through the firewall. There might be a fuse in the fuse box that might provide that but I hate tapping that way.
  3. bzyrice

    bzyrice Active Member

    Joined:
    May 15, 2011
    Messages:
    745
    Likes Received:
    181
    Location:
    West Palm
    Your Vehicle Year:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    On other cars I used the windshield wiper wires to tap into. Check those.
  4. seilerts

    seilerts Battery Curmudgeon

    Joined:
    Mar 7, 2010
    Messages:
    3,326
    Likes Received:
    1,438
    Location:
    Santa Fe, NM
    Your Vehicle Year:
    2005 Prius
    Model:
    N/A
    I've used the windshield washer pump wire on the Gen II and Sequoia. Works good, and there are almost no occasions where blowing the fuse would cause a driveability issue.
  5. robby3

    robby3 Member

    Joined:
    Mar 25, 2011
    Messages:
    179
    Likes Received:
    22
    Location:
    Switzerland
    Your Vehicle Year:
    2010 Prius
    Model:
    V
    Thanks for your replies. I have checked the washer pump but it has constant 12V and is activated by the relay. But this lead me to the idea to find another source there. And in fact on the top of the washer bottle there sits the headlight washer relais. One of its wires has IGN 12V and can be used for my puproses. Unfortunately, the front bumper must be removed to get access to the connector. Will post pics when I'm on there.
  6. bzyrice

    bzyrice Active Member

    Joined:
    May 15, 2011
    Messages:
    745
    Likes Received:
    181
    Location:
    West Palm
    Your Vehicle Year:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    awesome.. i will need to know this power wire for something i have in mind later..
  7. dick_larimore

    dick_larimore Member

    Joined:
    Feb 8, 2009
    Messages:
    137
    Likes Received:
    48
    Location:
    Central Indiana
    Your Vehicle Year:
    2012 Prius c
    Model:
    Four
    The easiest source of ignition ON power is to tap onto one of the legs of a fuse in the underhood fuse panel. The 10 amp IGCT #3 fuse is powered only when the ignition is ON. You can simply cut away the plastic surrounding one of the legs of the fuse at the top and solder a wire to the fuse. You can select one of the two legs of the fuse depending on whether you want the fuse to carry the current or not. The low clearance between the fuses in the panel and the fuse cover prevents using a plug-in fuse tap from being used.
  8. robby3

    robby3 Member

    Joined:
    Mar 25, 2011
    Messages:
    179
    Likes Received:
    22
    Location:
    Switzerland
    Your Vehicle Year:
    2010 Prius
    Model:
    V


    Thanks for your information, but no, I'd never do that. Even I'm an EE and I'm knowing what to do, I'd never tap into a fuse I don't know what else is feeded by this one.
  9. tonyrenier

    tonyrenier I grew up, but it's still red!

    Joined:
    Jun 29, 2009
    Messages:
    361
    Likes Received:
    42
    Location:
    Green Bay, WI
    Your Vehicle Year:
    2010 Prius
    Model:
    III


    You can use the parking lights to tap into. It's well illustrated in the OEM fog lights PDF on Priusshop.
    Hope that helps.
  10. dick_larimore

    dick_larimore Member

    Joined:
    Feb 8, 2009
    Messages:
    137
    Likes Received:
    48
    Location:
    Central Indiana
    Your Vehicle Year:
    2012 Prius c
    Model:
    Four
    Why not tap into a fuse? Every wire under the hood is being "fed" by something. Cutting into a wire is no different that pulling current off a fuse. I also am an EE.
  11. robby3

    robby3 Member

    Joined:
    Mar 25, 2011
    Messages:
    179
    Likes Received:
    22
    Location:
    Switzerland
    Your Vehicle Year:
    2010 Prius
    Model:
    V


    Unfortunately not. The parking lights only go on with the lights switch set to the first position. Having the Auto lights there is no power on any lights if ign is on and the lights not turned on (european car).

    A good source is at the plug on the top of the washer bottle. I'll use it when doing the DRL and horn mods.
Similar Threads: Need wire
Forum Title Date
Gen II Prius Audio and Electronics Do I need a different wire harness for 05 with jbl and nav? Oct 19, 2011
Gen II Prius Audio and Electronics Need ACC or IGN Wire near the Fuse Box Sep 16, 2011
Gen III 2010+ Prius Accessories and Modifications Help needed pulling wires through the rear hatch into the car Sep 25, 2009
Gen III 2010+ Prius Audio and Electronics HELP! Need audio remote turn on wire for subwoofer!!! Jul 16, 2009
Gen II Prius Audio and Electronics Need help identifying wires on back of radio... May 24, 2009