Question about Intermatic Malibu 300W Power Pack Transformer ML300RTW

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My lights connected to a Malibu ML 600 MT don't turn on - bulbs have been changed. The bulbs are low voltage and don't exceed the unit. Any ideas of what could be wrong? It worked for years- (which could be the problem)

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The problem will more than likely be your transformer. To test you can go get a cheap voltage tester from home or hardware store it to the lowest alternating current voltage setting and put the leads across the output of the transformer. Anything less than 12V and your transformer is shot. Its not expensive for a new one either if you just want to swap it out rather than messing with a tester.

Posted on Jul 11, 2010

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1 Answer

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

I have a ML500TW timer transformer I don't believe they make it any mor can I replace it with a 600


Yes, use ML 600 with 5 year warranty.
Save receipt.
Copy following link for useful information about getting new power pack to last longer.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

ML 600 will have 2 sets of ABC terminals.
Each terminal supports 300 watts.
Split lights between both sets of terminals.
Use 12 gauge wire. Maximum 75' length each wire.

Apr 15, 2013 | Malibu ML600TW - Low Voltage Power Pack -...

1 Answer

Won't work timer out


If light still turn on with override, then plug power pack into cheap in-wall timer.

Open following link for ML series troubleshoot steps and information:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Jun 25, 2011 | Malibu ML600TW - Low Voltage Power Pack -...

1 Answer

I purchase a Malibu ML600TW. My quest is. In this unit are there 2 separate 300 watt transformer. or when you contact the line in you are wiring to 600 watts.


With the 600 watt ML series, there are two sets of a-b-c terminals. C terminals are used with photo eye.
Connect 300 watts of bulbs to one set a-b terminals, connect 300 watts to other set of a-b terminals.
I'm not sure what is inside the power pack. However if you run less than or more than 600 watts or let your bulbs burn out for any length of time, the power pack can burn out. Save your receipt for limited 5-year warranty.

For your benefit, open following link for more information on ML power packs, plus troubleshoot, plus tips to keep power pack from burning out, and links to trippers:
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 24, 2011 | Malibu ML600TW - Low Voltage Power Pack -...

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

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

Can you hook up two 12 gauge cables to the power pack of the ML 300 RTW transformer. Power cable would run in different directions. Thank you Joe


Hello yes you can the Important thing to remember here is not to exceed the wattage that the transformer puts out.

Add up the wattage of each bulb that you are running and ensure that you do not exceed 300 watts.

for example a 300 watt transformer could drive
a. 10 - 30 watt bulbs
b. 20 - 15 watt bulbs
c 75 - 4 watt bulbs

Its also ok to mix bulb wattage for example I use 10 watt bulbs in the fixtures in the front of the house but also power 4 20watt spotlights from the same transformer.

Hope that helps

Feb 26, 2010 | Malibu ML300RTW - Low Voltage Power Pack...

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