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

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I just replace a light (not bulb) in my Malibu low voltage lighting system. That new light did not work and now all of the rest of the lights past this point no longer work. But the lights between this point and the tranformer still work. Obviously a cable issue, but should they all go out if the cable is cut or shorted?

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Working with the bulbs can cause other bulbs to go out.
Malibu suggests turn power pack off when replacing bulbs.
Also connections get loose and need to be re-attached.

Open following link for Intermatic/Malibu power pack resources.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Upvote the help.
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.
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Posted on May 29, 2011

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Malibu transformer


Unplug transformer, change bulbs with low voltage bulbs from local hardware or home center. There are two screws on back of each bulb.
Copy following link for tips to get power pack to last longer, replacement trippers, warranty, troubleshoot. etc
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html
Reason for unplugging transformer: because product manual lists that as best way to change bulbs. The low voltage transformer output is 12Volts and does not carry enough power to cause you harm if you touch bare wire.
Add a comment and attach photo as needed.

May 25, 2013 | Malibu ML600TW - Low Voltage Power Pack -...

1 Answer

Malibu 8100-0300-01


Promoters should include useful information. Not just air-head fluff.
Copy following link for actual useful do-it-yourself information such as warranty, troubleshoot, operation tips, manuals.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Aug 21, 2012 | Hardware & Accessories

1 Answer

I just replaced a light (not bulb) in my Malibu low voltage lighting system with a new one and the new one didn't work. Now the rest of the lights past this point do not work, but the ones before this...


Working with the bulbs can cause other bulbs to go out.
Malibu suggests turn power pack off when replacing bulbs.
Also connections get loose and need to be re-attached.

Open following link for Intermatic/Malibu power pack resources.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Upvote the help.
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.

May 29, 2011 | Malibu Intermatic Inc. ML300RTW 300-Watt...

1 Answer

My 600 watt 12 volt transformer timer for out door lighting does not keep time properly. HOw do I get and install a new timer?


1) Amazon sells 600Watt power pack:
http://www.amazon.com/Malibu-8100-9600-01-Voltage-Power-Transformer/sim/B002ZRPM4A/2

2) I bought new 300Watt Malibu power pack at Home Depot about 2 months ago.
Near the lighting section.
My new power pack has electronic time clock, so no more 'slow clock.'
I think Home Depot had 600Watt.
Lowes carries different brand.

3) Manuals for power packs at Malibu lights.com
http://www.malibulights.com/customer_service/owners_manuals.aspx

4) Tips for buying and taking care of power pack:
-Match up wattage of bulbs with wattage of power pack
-15 each X 20 watt bulbs = 300 watts, so install 300Watt power pack
-Installing a 500W power pack on 300W of bulbs will burn out bulbs and power pack.
-Replace bulbs as soon as they burn out or other bulbs will burn out and power pack will burn out.
-When working on bulbs, unplug power pack or it may burn out.
http://www.malibulights.com/guides_support/low_voltage_planning_guide/select_your_power_pack

5) How to install power pack.
Before unplugging old power pack, check which bulbs are not working.
Replace bulbs using phillips screwdriver.
Unplug power pack.
Notice how wires are connected to power pack, write down terminal connections.
Some power packs have three terminals ... extra terminal is for additional photoelectric eye.
Use pliers or screwdriver to disconnect wires.
New power pack has has same terminals.
Plug in power pack.
Read instruction manual before connecting wires.
Save instruction manual because a few years that manual won't be around as products change.

Dec 03, 2010 | Malibu Intermatic Inc. ML121RT Low...

1 Answer

Is there a fuse (or similar) INSIDE a Malibu 600 TW (6.0 Amp)?


There is no fuse
There are no replacement parts for Malibu power packs

Malibulights.com has no troubleshooting steps

Here's what I learned:

Power packs are made to last many years 'in ordinary conditions' >> but they do give out.
Malibu power packs stop working and have to be replaced, they can't be fixed.
Power packs frequently stop working when people disconnect all the lights to work on the system, but they leave the power pack plugged in.
Power packs make a humming sound when ON.
Check electricity to unit to see if power pack has electricity.
Check your GFCIs in bathroom and kitchen.
Plug hair dryer into same receptacle to see if there is power.
Lights have to be replaced as soon as they burn out.
With burned out lights, the power pack will overpower and burn out other lights.
Evidently the power pack with no lights can also burn itself out.
When buying a new power pack, match bulb wattage with power pack wattage.
10 - 20 watt bulbs = 200Watt power pack.
15 - 20 watt bulbs = 300Watt power pack.

Oct 22, 2010 | Malibu ML600TW - Low Voltage 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

Intermatic Inc. ML121RT Low Voltage 121-Watt Power Pack with Timer: I've had malibu lights for around 4 years,I have ...


If other lights are working the power pack is OK. Usually, as in your case, if changing the bulb doesn't work, check the connection where the light ties into the main run.

May 17, 2010 | Malibu Intermatic Inc. ML121RT Low...

1 Answer

Malibu Lights have voltage but 2 in the string of


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--

Jul 18, 2009 | Malibu Intermatic Inc. ML121RT Low...

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