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Thread: Haward Astrolite 12 volt 300 watt no longer lighting

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    Haward Astrolite 12 volt 300 watt no longer lighting

    My Hayward SP-581 12 volt fixture stopped working last year. Finally got around to changing the bulb when opening this year. Took out the unit which is submerged. Changed out the bulb and it is still not working. Unit looked fully sealed and dry inside. I'm not too familiar with transformers and how these units connect. I tested at the switch and it was operating and exporting 120 volts to the transformer. Can you point me to where or what I should test next? Thanks in advance for any help which is greatly appreciated.

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    Mod Squad Bama Rambler's Avatar
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    Re: Haward Astrolite 12 volt 300 watt no longer lighting

    Welcome to TFP.

    Are you getting 12 volts out of the transformer?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Haward Astrolite 12 volt 300 watt no longer lighting

    Quote Originally Posted by Bama Rambler
    Welcome to TFP.

    Are you getting 12 volts out of the transformer?
    That's as far as I got. Should I test for the 12 volts and the socket or somewhere around or in the transformer. Not familiar with opening or testing a transformer. Thanks.

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    Mod Squad Bama Rambler's Avatar
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    Re: Haward Astrolite 12 volt 300 watt no longer lighting

    If you test for it in the socket and it's there then that points to the lamp. If it's not there, test as close to the transformer as you can. Maybe at the junction box.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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