dl asked in Cars & TransportationCar Audio · 1 decade ago

Can four 55 watt, 12 volt lamps be operated in series with an in line 20 amp fuse? Hella 500's Jeep light bar.

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  • 1 decade ago
    Favorite Answer

    you need a 35 amp fuse and it is also a good idea to add a relay and run power from the battery to to the lights using the relay

    I DID INSTALL 4 HELLA 2 MONTHS AGO EACH COME WITH SET COMES WITH A RELAY FUSE

    the installer connect them together with a 30 amp fuse near the battery it burn a few times when the customer use the lights

    then we switch to a 35 fuse and it is working fine

    SO 1 FUSE 35 TO 40 AMPS

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  • 1 decade ago

    Four times 55 Watts = 220 Watts total load.

    Divide 220 by 12 volts = 18.333 Amperes (DC)

    A 20 Amp Fuse might hold the current load, but a

    25 Amp Fuse sounds more realistic due to the

    line connection loads, and possible voltage drops

    at any of the lamp contacts.

    Source(s): Licensed CA smog inspector.
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  • Anonymous
    1 decade ago

    WOW! Nobody has a clue.

    A 25 amp fuse is the lowest required, however, running 12V lights in series will divide the voltage to each light by 4. Each light will only get 4 volts and therefore won't light.

    To keep the right voltage, wire the lights in parallel. There are NO lights ran in series in the car, they are ALL in parallel.

    Source(s): A.A.S. degree in Electronics/Industrial Electronics with 25 years in the mobile audio/consumer electronics field
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  • 1 decade ago

    i would just stick to the two seperate fuses that it comes with in the harnesses.(each pair should have a fuse in the pre-wired harness)

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