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Looking for 12v power source in engine compartment

Discussion in 'Boxers/TR/M' started by 1TRICK6, Jun 28, 2020 at 4:36 PM.

  1. 1TRICK6

    1TRICK6 Karting

    Aug 28, 2014
    150
    So. Cal (L.A./O.C.)
    Full Name:
    Jim
    Looking for a quick tap-in to get a hot 12v power supply preferable in the right rear engine compartment area for my 89TR.
    Needed to power license plate flipper (used for car shows & events of course).
    Any suggestions.
     
  2. Qavion

    Qavion F1 Rookie

    Feb 20, 2015
    3,506
    Sydney
    Full Name:
    Ian Riddell
    Can't think of anything other than the starter. It may be better to wire the flipper into the number plate lights and just turn on the lights. What kind of current does your flipper draw?
     
  3. 1TRICK6

    1TRICK6 Karting

    Aug 28, 2014
    150
    So. Cal (L.A./O.C.)
    Full Name:
    Jim
    Very little current draw, 8AA's batteries probably would run it, but would hate to put batteries in that hot eng compartment.
     
  4. Qavion

    Qavion F1 Rookie

    Feb 20, 2015
    3,506
    Sydney
    Full Name:
    Ian Riddell
    If the flipper only uses power for a second or two, I guess using the number plate light power should be ok. Fuse 13 does power quite a few lights though:

    side markers (front and rear)
    tail position lights
    number plate lights
    engine bay lights (when lid raised)
    other lights which I was unable to identify.

    The 0.8mm^2 wire going to the number plate lights should be able to handle an amp or two. Do you need constant power for a wireless remote for this flipper system?
     
  5. 1TRICK6

    1TRICK6 Karting

    Aug 28, 2014
    150
    So. Cal (L.A./O.C.)
    Full Name:
    Jim
    Yup, has to have constant power. Power to license plate light wiring would only be available if I have parking lights/headlights on.
     
  6. rpissm

    rpissm Formula 3

    Aug 11, 2013
    1,525
    Salt Lake City, UT
    Full Name:
    Joe
    Yeah back of starter has direct line to battery

    Sent from my Moto Z2 Play using Tapatalk
     
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  7. Qavion

    Qavion F1 Rookie

    Feb 20, 2015
    3,506
    Sydney
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    Ian Riddell
    #7 Qavion, Jun 29, 2020 at 7:25 PM
    Last edited: Jun 29, 2020 at 7:34 PM
    Unfortunately, this car doesn't seem to have a battery bus bar in the engine compartment, say, like a F355.

    There is really not much use for power to devices when the car is turned off. Hazard lights, cigar lighter, park light switch, headlight pod motors (down), clock, etc...

    Here's the wiring diagram for the lights...

    Testarossa (USA) Lighting Wiring Diagram Fig5

    ... and the starter:

    Testarossa(USA)BatteryAlternator&StarterFig1

    EDIT: I just noticed hot 12 volts in the relay black box "137". There is a 10amp fuse inside the box with power on it. Is this closer to the number plate lights than the starter?

    Testarossa (USA) Injection System Fig3
     
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  8. Qavion

    Qavion F1 Rookie

    Feb 20, 2015
    3,506
    Sydney
    Full Name:
    Ian Riddell
    1TRICK6 likes this.
  9. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    6,167
    southwest germany
    Full Name:
    romano schwabel
    don´t forget to use also a fuse
     
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  10. 1TRICK6

    1TRICK6 Karting

    Aug 28, 2014
    150
    So. Cal (L.A./O.C.)
    Full Name:
    Jim
    @Qavion,
    I'll check the relay box today for juice, if none it looks like I'll have to get it from the starter.
    Nice wiring diagram.
     
    Qavion likes this.

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