Who is using what for a headlight relay kit?? (brighter headlights) H4

Discussion in 'Electrical Systems' started by QUAKE_WARS, Aug 8, 2019.

  1. COPO

    COPO Veteran Member Lifetime Gold Member

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    The fuse will pop before it gets too hot.
     
  2. junkyardZ28find

    junkyardZ28find Veteran Member

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    Not always the case-a slow, parasitic voltage loss and amperage gain can increase the amount of heat until it melts. Once the thermal runaway process starts, that fuse may not pop because the current isnt reaching (ie being used) the headlights because of the switch. To a lesser extent that is also the reason why fusible links protect better than just a fuse on individual circuit runs.
     
  3. Jeep43

    Jeep43 Veteran Member

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    My setup had separate relays with hot and ground splitting in parallel to the relays.
     
  4. COPO

    COPO Veteran Member Lifetime Gold Member

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    Last edited: Sep 16, 2019
    Rene Melten likes this.
  5. hot72rod

    hot72rod Veteran Member Gold Member

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    If done correctly the headlight switch on the dash will only be see the 12v from the fuse box. The headlight switch is being used to turn the relay on. The relay is what should only be drawing current from the battery.
     
  6. COPO

    COPO Veteran Member Lifetime Gold Member

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    Mine
    633906A6-F58F-4DF9-A773-921F1EA983EB.jpeg 8EC26167-BEC8-4909-A228-C20AD297310A.jpeg
     

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