Question about Malibu Intermatic Inc. ML121RT Low Voltage 121-Watt Power Pack with Timer

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Malibu Lights have voltage but 2 in the string of

Malibu Lights -- 2 in the string of 6 do not work, but have voltage? Any ideas to check? Thank you.

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  • lynnb75 Jul 18, 2009

    Thank you---they are all lit now---we took apart wiring & re-connected.

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If voltage is present, it has to be the bulb, usually, depending on the socket. Look at the socket closely, and make sure that the base makes proper contact with the bulb. They can distort just enough to trick you. If you can, make a set of mini-jumpers with alligator clips and wire. Connect from the base (socket) to a known good bulb. It's quite possible that there can be voltage present in the wiring, and none to the light, indicating that either there is a problem with the connection where the wiring passes through on the way to the next light, or in the fixture itself. My guess is that in the press-on connection, one of the spikes has missed the wire. Take that apart and reconnect; it'll probably do the trick.
Regards, --W/D--

Posted on Jul 18, 2009

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Our lights were all connected to one transformer, but the second half of the lights were dimmer than the first half. I installed a second transformer to help eliminate the dimming for the second half of...


1) Problem could be transformer voltage and/or length-and-diameter of wire.

2) Open following link for power pack resources including links to manuals, tips, trippers, instructions, and troubleshoot:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

3) Unclear what is meant by 1st half and 2nd half of lights.
Do not connect transformers in parallel or series with each other.
Test across terminals A and B and see if it shows 12 Volts. If voltage is less, then power pack is not functioning correctly.
Power pack wattage must match total wattage of bulbs.
First bulb must be 10 feet away from transformer.

4) Use following chart for wire size:
http://waterheatertimer.org/images/Malibu-cable-lengths-300.jpg

5) Review resources above, and then add a comment for more help.

6) Take a moment and rate answer:
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 05, 2011 | Malibu Hardware & Accessories

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I put in a new 200 w Malibu LV. It worked one day, then only one light would work. The next day it worked again on all lights then it went back to lighting only one. I'm using a combination of 12 LV...


I don't have repair for defective transformer.
The transformer puts power on the wire. Buy multimeter and check voltage across the terminals.
If wires are loose, or bulbs are not connected to wire, or bulbs burned out, or if wattage of bulbs is mis-matched with transformer wattage, then lights might not work as expected.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Aug 16, 2011 | Intermatic & Malibu& 300 Watt Power/Pack...

1 Answer

How would i fit down lights into my stairs? i am wanting to place 2 down lights into each step. i am replacing the 50wat bulbs that came with them to new supabrite led 1.4wat blue. just need an idea of how...


Find where the voltage source is controlled to turn the present lights on and off and disconnect. You need to retrofit a Malibu type voltage transformer that will provide the appropriate voltage; from what you say you want a transformer that provides the voltage of the 1.4 watt blue light, most likely 12 volts. When the switch that controlled the old lights is turned on, it will now provide voltage to the Malibu type transformer.
You can check out the Malibu web site for what's available or go to Lowes or Home Depot. Please let me know if you have questions.

Sep 28, 2010 | Hammering

1 Answer

Some of the malibu lights on the string are lighted and some are out. I even changed the lights and they stil do not work.


Check where the wires from the individual lights connect to the main power cord. Many times, that is a problem area. An automotive 12 volt test light is real handy working on these as sometimes the 12 volt low voltage bulbs look good, but aren't.

Aug 25, 2010 | Garden

1 Answer

Transformer problem


Malibu power pack has to match total watts of bulbs

15 bulbs each 20 watt = 300 Watt power pack
10 bulbs each 20 watt = 200 Watt power pack

Mar 01, 2010 | Malibu ML200RTW - Low Voltage Power Pack...

1 Answer

Power at 3 feet, not at 2 feet ???


You might need to check the power source for proper voltage, sometimes outdoor wiring is at the mercy of the elements. Rusty screws on recepticles and so forth. Another problem could be exposed wire in the line bleeding of to ground. Sometimes this happens if a fixture is removed and the wire not properly protected. If these are none of your problems just take up your fixtures and replace the wire. 16 guage underground feed will probably be less expensive than the transformer you bought.

Aug 08, 2009 | Malibu Intermatic Inc. ML121RT Low...

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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