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I have a 12 volt, 121 watt max outdoor timer for landscape lighting. Model #ML121RT. The timer stopped functioning and the clock seems to turn free, but does not rotate automatically. My phone number is 407-362-1913 Thank you for any help you can provide. Bruce schmacker

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If the clock seems to work ok then the problem is most likely a defective relay that turns on the power to the light's at the specified time set, I show this timer cost about $43 on average with a net search for the product, in the case of he this timer is is much cheaper to just replace it than to have it repaired, these kinds of products are disposable consumer electronic goods. here is a link to a web site to purchase another unit like this one.

Posted on Oct 07, 2009


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Describe your Inc. ML121RT Malibu Low Voltage 121-Watt Power Pack with Timer Problem Clock does not keep time

If clock has slowed down or is running reversed or gets stuck on the tripper, then clock motor has gone bad.
There are no replacement clock modules for this product, but product comes with warranty.
Work-around: Buy cheap plug-in timer, set power pack to override, and plug power pack into cheap timer:

Resources: including warranty links, tips, trippers, etc:

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And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Sep 11, 2011 | Intermatic Inc. ML121RT Malibu Low Voltage...

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Power into unit ok power comming out of unit is very dim.

If you have a volt meter, check the voltage, I believe it is supposed to be 12 volts.
Are your bulbs the proper voltage rating, that is 12 volts.
Do you have enough bulbs connected to the transformer, connected load should be close to 121 watts when you add up all your bulb wattages.
Don't confuse volts with watts. The transformer reduces voltage to 12 volts, but the wattage of the transformer is 121 watts. Each bulb must be 12 volts but wattage (brightness) can vary depending on the fixture from maybe 7 watts to over 50 watts.

Dec 01, 2010 | Intermatic Malibu 121W Power Pack...

1 Answer

The bulbs burn out after a short time

if you have a meter you can check the voltage coming off the timer it should read 12 to 13 volts also check to make sure your connections are all tight

Sep 29, 2010 | Malibu Intermatic Inc. ML121RT Low...

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I bought a 12 volt landscape lighting system with no instructions and i have never hooked up 12 volt i connect the wires on the end of the run??

No, they stay apart, think of it like a railway track, that you Tap onto each rail, as you go down the track... For a light there is no polarity, just as long as you have two separate wires you will be all good.

Mar 03, 2010 | Intermatic Inc. ML121RT Malibu Low Voltage...

2 Answers

Malibu Light Transformer ML121RT troubleshooting

1) Disconnect the plug.
2) Remove the 3 hex screws holding the cover.
3) Make a note of all connections (taking a picture is even better).
4) Connect the black power wire to the red transformer wire.
5) Connect the white power wire to the white transformer wire.
6) Set your voltmeter to 20 or 50 volts AC (not DC and not less than 15 volts).
7) Plug the transformer in the wall.
8) Test the voltage coming from the A & B connectors at the back (polarity is irrelevant).
If you see 12 volts or thereabout, the problem is with the little switch (the one with the black and red wires that is activated by the trippers on the clock dial). I have the exact same problem but I have been unable to locate the part so I am going to try to clean the contact points and see if that works.

Jun 22, 2009 | Malibu Intermatic Inc. ML121RT Low...

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