Question about Intermatic Malibu 300W Power Pack Transformer ML300RTW

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How to wire malibu ml 300rtw tranisformer - Intermatic Malibu 300W Power Pack Transformer ML300RTW

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Need schematic of Malibu ML-900tw

There is not internal schematic of the Malibu ML900 series power pack... you could take one apart and post the information on your website.
If you want basic tips for installing ML900 series power pack, the following link has detailed information and tips to help do-it-yourself folks...
Correct installation will ensure power pack lasts longer:


Water Heater Timers Save Money

If you need further help, I’m available over the phone at

Jul 10, 2014 | Malibu ML900TW 900 watt Power Pack Timer...

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.

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.

If you need further help, I’m available over the phone at

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

1 Answer

Photo cell has short in wire,how do you repair

Splice the wire? Replace photocell?

What photo eye do you have? Intermatic ML series, or orher?
Where is the short?
What makes you think there is a short?
Have you tested the gfci?

If you need further help, I’m available over the phone at

Apr 06, 2013 | Intermatic Malibu 300W Power Pack...

1 Answer

Where can I order some replacement ML Power Pack trippers for a ML600TW and ML 300RTW timer?

1) Copy following link for ML series trippers, troubleshoot, 5-year warranty info, and tips to keep power pack running longer.

2) Add comment if more help is needed. Jan 2013.

If you need further help, I’m available over the phone at

Jan 18, 2013 | Intermatic Inc. ML121RT Malibu Low Voltage...

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I am installing a new intermatic timer when I split the wires and put the strip one under a and b what do I do with the left over wire?

Timer is not identified.
You posted under power pack.
ML300, 600 and 900 power packs have three terminals: A B C
Typically the low voltage cable has two wires: Connect wires to A and B terminals, and use C only when installing Intermatic ML series photosensor control.

Add a comment with identification of product and send link to photo posted on flickr for more assistance.
Open following link for power pack resources, tips, photosensor control wiring, and manuals.

Jul 11, 2011 | Malibu Intermatic Inc. ML300RTW 300-Watt...

1 Answer

Two things, what size and thread screws on the wire connections and are there separate on off cycles for each 300 watt unit if so how do you set them separately \

ML series power pack has 2 sets of A-B-C terminals.
1) The terminals are not on separate circuits.
2) Typically, Intermatic timers have 10-32 screw.
Open following link for Intermatic/Malibu resources, tips and links to Malibu and Intermatic manuals.

Add a comment for more help.

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.

Jun 12, 2011 | Malibu ML600TW - Low Voltage Power Pack -...

1 Answer

My transformer has just stopped working. was fine 24 hours ago- is there a trip switch? Model LV300/LV300T

There is no trip switch, or reset button for ML series Intermatic/Malibu power packs.
Your question shows LV and not ML, so there might be a different model number, but generally power packs are not a repairable item if power pack is broken.
Add a comment with in-focus photo of your timer for possible identification difference between ML series and your power pack.

Open following link for Malibu troubleshooting steps and possible assistance:
Note: Intermatic links sometimes don't work on weekends, April 2011.

Power pack parts are not available except for trippers

Apr 23, 2011 | Intermatic Malibu 300W Power Pack...

1 Answer

My ml600tw timer stopped working. How do you replace the timer? I took screw out by timer but I cant pull timer out. Is it held in another way?

You posted under Intermatic/Malibu ML series power pack.
There are no replacement clock mechanisms or timer modules for ML series power packs.
If you found a replacement clock motor source, add a comment add a comment here so others can benefit. If you find a way to repair clock motor, also add a comment.
Many people have same problem and will benefit from your discovery.
To work around problem, buy cheap plug-in timer, set power pack to override, and then plug power pack into cheap timer.
ML series has 5 year limited warranty.

Open following links for troubleshooting resources, warranty links, manual links and Intermatic parts:

Apr 19, 2011 | Malibu ML600TW - Low Voltage Power Pack -...

1 Answer


First test your ac voltage going into the transformer. Then with the lights disconencted check the voltage at the terminals. (make sure your tester reads 12V DC) If you have voltage now, then you most likly have an open circuit or a short in your lighting wiring, or fixture socket.

Jul 19, 2010 | Malibu Intermatic Inc. ML300RTW 300-Watt...

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