Question about Intermatic Malibu 121W Power Pack Transformer ML121RT

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How many feet of wire can you run with a malibu MT121RT power pack

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Posted on Aug 23, 2011

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I had a Malibu ML150 power pack that quit, I need to attack a malibu 300 to the light wires. One is push one connection, the new one has screw clips. Do I cut the old push on connectors off?

Cut em off. Attach wires to A and B terminals on ML300.
Do not plug in power pack until all lights are wired.
Read the product manual.

Copy following link for tips to get new power pack to last longer, including 5-year warranty information, replacement trippers, wiring etc:


Oct 01, 2013 | Malibu Intermatic Inc. ML300RTW 300-Watt...

1 Answer

I have (7) 20W bulbs on a newly wired line running on a brand new 200W Malibu transformer, worked fine for 2 days and now it's tripping the reset button - Any suggestions ??

1) Copy following link for malibu power pack tips for longer transformer life:

2) Two plug choices on each outlet, Plug power pack into other outlet on receptacle.
Inspect for damage on outdoor outlet.
Replace outdoor outlet, and do not use quick connects. Connect wire directly to screws on side of device.
Replace GFCI outlet.

Feb 01, 2013 | Malibu Intermatic Inc. ML121RT Low...

1 Answer

Can I mount the malibu 600 watt power pack inside a garage

Yes. ML600 can be installed inside garage.
This series low-voltage timer is OUTDOOR timer since the wires and open wiring terminals are small hazard inside home. Somebody may trip over wires.
Open following link for tips, wiring, manuals, and troubleshoot:

Jun 24, 2012 | Intermatic Malibu 300W Power Pack...

1 Answer

300W transformer shuts off after 1-3 hrs (231w: OK w 181 watts)

The following might apply to your situation, or not.
Malibu recommends matching wattage of bulbs to wattage of power pack.
In your case, you have 181 watts on 300 Watt power pack.
Based on other folks questions to fixya, this condition can burn out the power pack.
Has your power pack overheated and been damaged?
I don't know, but it might be a good suspect.

For more information on Intermatic/Malibu power packs showing troubleshoot steps, replacement trippers, useful links, warranties and tips:

May 02, 2010 | Intermatic Malibu 300W Power Pack...

1 Answer

Timer running very slow on my malibu ml200rt

You posted under Intermatic-malibu power packs.
There are no replacement clock motors.

Improvise by setting timer to override and plug power pack into cheap plug-in timer.

For information on Intermatic/Malibu power packs showing troubleshoot steps, replacement trippers, useful links, warranties and tips:

Apr 03, 2010 | Malibu ML200RT - Low Voltage Power Pack...

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