Relay/Fusebox Best Practices?

Discussion in 'Electrical' started by flashstar, May 7, 2014.

  1. flashstar

    flashstar Member

    As I am collecting parts for my XR-80 board track racer build, I'm focusing on building a reliable electrical system. I plan on having the following:

    -Ecotrons EFI kit with 2.5 amp fuel pump, CDI, etc.
    -2 amp headlight
    -5 watt tail light
    -turn signals
    -car/motorcycle horn
    -Trail Tech Vapor digital guage
    -Phone holder/ charger?

    -3700mah battery
    -DC regulator/rectifier
    -100 watt stator

    Coming from the car world, I use relays and fuses for each component. In fact, I was planning to purchase a micro relay box for this xr-80 build. I couldn't find anything for motorcycles however.

    Should I use the PC-8 switched fuse box (to make sure that nothing drains my battery), then an additional relay for the headlight? I'm not sure if it's smart to run 2 amps through a cheap headlight switch.


    See my build thread here!

  2. butre

    butre Well-Known Member

    I've only got an inline glass fuse for my turn signal flasher and haven't had my lights or horn burst into flames yet. Everything on my bike draws so little current I don't think it really matters that much.
    That said, I'm planning on tidying up my wiring and will set up a blade fuse panel when I get around to it.

    On this sort of scale there's no practical difference between relays and switches, and I'm sure you know a relay is just an electromechanical version of a switch.
  3. flashstar

    flashstar Member


    Thanks for the help. I guess that I don't have to be too worried about my headlight switch. I'll make sure to use a higher-quality unit.

    I do like how the PC-8 provides a single, covered place for all of the fuses. It may involve a bit more wiring, however I guess that a simple fuse panel would work almost as well.

    Do you think that the PC-8 is overpriced?
  4. butre

    butre Well-Known Member

    They're not cheap, but it's a robust design using good quality components. A PC-8 will likely outlast the rest of the bike.