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Thread: 12 v Power relays

  1. #1
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    Default 12 v Power relays

    Question.

    How many 1156 12 volt fixtures should or could be safely in series, or strung togeather, before they become too much on a toggle switch and a relay becomes nessessary?

    I know all toggles r not created equal either.

    How to proceed with 10 ceiling 1156 fixtures going in on 1 switch.
    1990 Peterbuilt 377
    3406 B Caterpillar
    9 Speed Roadranger
    708 243 7871

  2. #2
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    Plan for 2.5A per bulb. Don't forget that the switch or relay and wiring must support the total load. Just for clarity, they will be connected in parallel ( positive to positive) not series (positive to negative).

    That is a seriously bright bulb at nearly 27 watts. Are you sure you want them for ceiling lights?


    Gil and Durlene
    2003 H-3 Hoffman Conversion

  3. #3
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    Yes Gill and yes parallel too my mistake.

    20170523_073102.jpg

    I'm replacing a ceiling on a trailer that I'm modifying. The fixtures that were up there were 10 1156s with no relay that's no good. So a 30/40 amp relay would be just a tad overrated and 12g wire. Right?? That would be happy?

    20170523_073144.jpg

    20170516_095950.jpg
    Last edited by Joe Camper; 05-23-2017 at 12:45 PM.
    1990 Peterbuilt 377
    3406 B Caterpillar
    9 Speed Roadranger
    708 243 7871

  4. #4
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    20170523_175228.jpg

    The mac daddy of dome lights. This is how u can get away with an 1156 and not melt the lense.

    Quite amazing it didn't roast the switch. They all have individual on off buttons as well, so, evedently they never had them all going at the same time or for very long without controlling them with a relay like it was.
    1990 Peterbuilt 377
    3406 B Caterpillar
    9 Speed Roadranger
    708 243 7871

  5. #5
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    I would suggest 2 circuits and 2 15A switches without relays using 12AWG. Or 2 circuits, 2 15A relays and one 2A switch using 12AWG. Or 1 circuit 1 30A switch using 10AWG.


    Gil and Durlene
    2003 H-3 Hoffman Conversion

  6. #6
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    Thanks Mr Bus Driver
    1990 Peterbuilt 377
    3406 B Caterpillar
    9 Speed Roadranger
    708 243 7871

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