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

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All of my malibu lights went out. At the output terminals of the transformer I measure zero volts with the light wires connected but when I disconnect the light wires from the terminals I measure 13 volts.

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  • lansjinlv Sep 11, 2010

    This system was installed 10 years ago and has been working fine until just a couple days ago.

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Sounds like a short in the wiring. If you have more than one set of wires connected to the unit, disconnect all of them and put them back on one at a time, measuring the voltage each time. If a particular set of wires causes the reading to go to zero, I would trouble shoot that set of lights to see where the problem is. If there is only one set of wires connected to the power unit, I would trace it out to each light and see if you could locate the problem.

Posted on Sep 12, 2010

  • pwillitz Sep 23, 2010

    I am sorry you did not find my solution to be helpful.

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H ow to replace timer with phot0 cell


Malibu ML300 has 120 volt input and 12 volt AC output
They make a photo eye for the timer... wiring is changed a bit... will work on ML300 if timer has A-B-C wiring terminals
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html#wire

You can use a 120 -> 12 volt ac transformer that is rated for 300 watts... and connect in-line photoeye on the 120 volt side.
http://waterheatertimer.org/How-to-install-and-troubleshoot-photo-eye.html
http://waterheatertimer.org/Reverse-photo-eye-so-it-turns-on-at-daytime.html

Gene
Water Heater Timers Save Money

Jul 17, 2015 | Malibu ML300RTW - Low Voltage Power Pack...

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I have a 2012 Dodge Grand Caravan with the 3.6 pentastar. I have the battery light on on my dash and with my scan Guage connected to the obd2 connector inside the van it's showing 12.3 with the van...


Your charging system is not working correctly. Unlike most other vehicles, the alternator in yours does not have a built in regulator circuit. Some troubleshooting must be done to find the defective component. Most of this can be done with the vehicle still assembled.

First, check that you don't have a blown fusible link. In most newer cars, these will be in the underhood fuse panel, and look like giant fuses. If good, you will read very nearly zero volts and zero ohms when measuring between the positive battery terminal and the alternator output terminal. If either measurement doesn't read zero, find the loose connection, bad wire, or blown fusible link.

Next, check the ground connections to the engine, battery, and car body to make sure you don't have a bad wire or connection somewhere. Again, measure voltage and resistance between the negative battery terminal and all associated grounding locations. For a quickie test, you can rig a jumper cable between the battery negative terminal and the alternator case. If there is a spark when you make the connection, you have a bad ground somewhere.

If your battery is well connected to the alternator, the problem may lie in the control circuit. Most Chrysler alternators have two control wires that control the field coil. Some control the battery current and have constant ground supplied, and some have battery voltage applied and control the ground current. To test, disconnect the control connector and measure the voltage of both terminals with the ignition in the "off" and "run" positions. Make a chart of each terminal and its corresponding voltage.

Start the vehicle and measure both terminals again. If the terminals tend to be zero volts, except when the vehicle runs you have voltage on one terminal, you have a system where the computer controls battery voltage. If the terminals tend to be 12 volts when the ignition is on, then one terminal goes low when the engine runs, the computer controls ground current. If the voltages of one terminal change but not the other, this suggests a bad computer.

To do a go/no go test of the alternator unit, you can connect the control pins on the alternator with the control connector disconnected. Simply connect jumper wires to the two control terminals of the alternator. Connect one jumper to a known good ground, leaving the other jumper loose. Connect a voltmeter to the battery terminals or to the output wire on the alternator. Start the vehicle and briefly connect the second jumper wire to the positive battery terminal while watching the voltmeter. While the jumpers are both connected, the battery voltage should rise dramatically.If it doesn't, this suggests a bad alternator.

If all this sounds too complicated or dangerous, a good mechanic can perform a similar diagnosis in under an hour with definite results. Good luck.

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1 Answer

Schematic malibu 8100-9120-01


http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

I don't think they post schematic for the transformer
But generally, the primary coil receives 120Volt AC input from household electrical outlet
And the secondary coil produces 12Volt AC output for the low voltage lights.
The 'coil' is a coil of insulated wire wrapped around a metal core. Two coils set side by side create a transformer... when primary is energized, the secondary responds to the magnetic field caused by primary core... resulting in a current that flows on the secondary coil.
Output voltage on secondary coil is determined by the number of wraps and diameter of wire.

Some transformers offer a choice of secondary output... Kichler for example... you can select 12-13-14-15 Volt AC output
This is achieved by the way the secondary coil is wrapped.... for less voltage a wire is tapped at one point on the coil... for more voltage, a wire is tapped at another point on coil. This gives the user several wire choices to connect the lights.

Gene

May 09, 2014 | Intermatic Malibu 300W Power Pack...

1 Answer

Where to thw wires go


Output wires (going to lights) connect to different terminals depending on desired output voltage.
For example 12 volt, 13 volt or 15 volt.
Input wires (coming from power source) depend on specific timer. Some timers plug into outlet, while other are hardwired.
Copy following link for some example Kitchler transformer wiring.
http://waterheatertimer.org/pdf/Kitchler-transformer-wiring.pdf

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1 Answer

My vector vec157 will not charge on 120 volt. It works on 12 volt


If you light is charging when you use the 12v automotive charger but not when you use your AC power transformer, my thought is that you might have a problem with your AC charger, not with the light itself. I have AC/DC transformers from the 1970s that still work fine, but I have had numerous modern AC/DC transformers burn out on me in recent years.

One easy test is to use a multimeter to measure the output voltage of your wall charger. Place one test lead on each of the charging terminals (i.e., one inside the barrel and one outside the barrel, if you have a standard coaxial charging port) and check the DC reading. If it's zero--or anything less than 12 volts, actually--the charger isn't working correctly. The problem may be a torn or cut wire or something actually inside the transformer.

Replacement chargers can be found at Radio Shack and other stores. You may also be able to score a cheap replacement at a "dollar plus" store or even at a second-hand shop. Make sure that the terminal polarity is correct on your replacement charger or else you'll fry the batteries in your light.

Good luck!

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1 Answer

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

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Hello! I have a Malibu transformer for my outdoor lighting. Last night, we had a severe rain storm. During the storm, my outdoor lighting went out. When I went to check the transformer box this...


My malibu transformer has a reset button on the back near the terminal connections. If the transformer is on (time displays on the panel) but the light fixtures are not lit, look for the reset button on the back and depress it.

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2 Answers

Malibu ml200rt internal wiring schematics


If you have a meter you can test for 12 volts AC on the output of the transformer. They go to terminals
A & B

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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.

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1 Answer

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Testing ohms across A and B will read open circuit through transformer coil.
Testing DC voltage across terminals A and B should read 12 volts DC, and nothing less.
Transformer should make humming sound when working.
Test that receptacle has power and breaker is not tripped.

There are no repair parts for power packs, but they come with 5 year limited warranty.

For more information on Intermatic/Malibu power packs showing troubleshoot steps, replacement trippers, useful links, warranties and tips:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

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