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Under the hook fuses and relays check

Discussion in 'Gen 3 Prius Technical Discussion' started by Drepdom, Feb 24, 2024.

  1. Drepdom

    Drepdom Junior Member

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    2015 Prius 3, 155k mi. My simple question is if the battery negative or power in general have to be cut off to be able to remove or replace fuses (10A PCU, 7.5 P CON MAIN)or relays (DRL fog light) from the fuse box; or shutting down the car is enough?
     
    #1 Drepdom, Feb 24, 2024
  2. StarCaller

    StarCaller Senior Member

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    Just turn the car off /
     
    #2 StarCaller, Feb 24, 2024
    bisco likes this.
  3. Drepdom

    Drepdom Junior Member

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    Then I don't understand. With the veh off , I removed a add a circuit and added back the original drl fog light relay. So, when I went to turn on the car I got the.. look at the pics.. and I haven't been able to driver my car for almost a week.
     

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    #3 Drepdom, Feb 27, 2024
  4. Brian1954

    Brian1954 Senior Member

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    How old is your 12v battery?

    Measure the voltage of the 12v battery when the car is off.

    Do you own a 12v battery charger? Is so, connect it to the 12v battery and charge it up.
     
    #4 Brian1954, Feb 27, 2024
  5. Drepdom

    Drepdom Junior Member

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    The battery is from 1/22 and I bought it on 12/22. It charges all the way up to 13.49v. But in about .30 min it drops to 12.4v
     
    #5 Drepdom, Feb 27, 2024
  6. Brian1954

    Brian1954 Senior Member

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    Did you measure the battery voltage before you charged it?

    Did you try starting the car after you charged the 12v battery?
     
    #6 Brian1954, Feb 27, 2024
  7. rjparker

    rjparker Tu Humilde Sirviente

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    Assuming the add a tap circuit was not necessary, the relay used may be wrong.

    To get better feedback add more details.
     
    #7 rjparker, Feb 28, 2024
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