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

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I need 3 on and 3 off trippers for a malibu time clock, model mu60t

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I answer questions for free.
I specialize in timers and electrical devices.
I hesitate to answer about Malibu power packs because there are no parts or repairs for a power pack, and the owners of this product are angry that such an expensive item is unrepairable and then they downvote a truthful answer that is provided for free.

Here's what I've done for fixya customers.
For hours, I searched Intermatic Timers,, and the web looking for parts and solutions for the Malibu power pack. There are no parts or solutions.

I purchased a power pack from Home Depot and examined it and then read the manual from head to toe.

The answer is this: if the power pack is not working for any reason and the receptacle has power, then the power pack is busted and you need another one.

However I can save you money on your next power pack, and that may be worth your trouble coming to fixya:
Your next power pack:
1) Match up wattage of bulbs with wattage of power pack.
15 each - 20 watt bulbs = 300 watts = 300 watt power pack ... if you buy the 500 watt power pack for 300Watts of bulbs, then it will burn up the bulbs and the power pack.
2) Replace bulbs as soon as they burn out or other bulbs will burn out and the power pack will burn out
3) When working on bulbs, unplug power pack or the power pack may burn out
4) Use the link below to help plan your low-voltage lighting

Posted on Nov 07, 2010


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Posted on Jan 02, 2017


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On/off tripper problem with T 103 timer

if it won't trip it, the on pin is not lining up right and u need to take it off and put it making sure it is right. if that's not it u got a bad timer

Mar 26, 2012 | Intermatic Hardware & Accessories

1 Answer

Describe your Inc. ML121RT Malibu Low Voltage 121-Watt Power Pack with Timer Problem Clock does not keep time

If clock has slowed down or is running reversed or gets stuck on the tripper, then clock motor has gone bad.
There are no replacement clock modules for this product, but product comes with warranty.
Work-around: Buy cheap plug-in timer, set power pack to override, and plug power pack into cheap timer:

Resources: including warranty links, tips, trippers, etc:

Take a moment and rate answer:
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.

Sep 11, 2011 | Intermatic Inc. ML121RT Malibu Low Voltage...

1 Answer

The timer has started stopping at the time it should switch on, as though it is stuck. It works fine if I turn it on manually and turns off at scheduled time. I am thinking it might be the timer tripper...

You can buy trippers, but problem is the timer clock motor has gone bad.
Clock modules are not sold separately.

Maybe easiest to buy cheap plug-in timer, set power pack override to ON, then plug power pack into cheap timer.

Aug 21, 2011 | Malibu ML88TL 88Watt Low Voltage Power...

1 Answer

I am looking to get a Malibu digital landscape transformer, such as model # 8100-9045-01, and I'm wondering if they have a "memory backup". In other words, every time there is a temporary...

8100-9045 is rated for 45 watts.
That's two 20 watt bulbs, or three 15 watt bulbs.

Power outage carryover: Contact Malibu directly since there is conflicting information on Malibu site:

8100-9045-01 45-watt power pack page on the support tab says 'loss of power will stop timer.'
And then mentions tripper.

However other information on Malibu wesite contradicts power-outage information and shows 8100 series timer is electronic and is controlled by photoeye, and that timer has no tripper.
As a general rule with electronic timers, there is battery or capacitor carryover.

Aug 20, 2011 | Hardware & Accessories

1 Answer

I installed a new Intermatic 200w powerpack with 15 malibu lights using 131 watts. The lights turn on manually, but the timer doesn't work. How is this possible.

More information is needed.

Open following link for Intermatic-Malibu resources:

You say clock doesn't work.
Add a comment with following information:
Do you have timer with analog dial?
Does dial rotate as time passes?
Does dial keep good time?
Have you put the black and red trippers in place?
Are trippers push all the way down?
Have you set current time by rotating clock dial 2 full turns before rotating dial to current time?

Intermatic/Malibu ML series timers come with 5-year warranty.
Product is covered by warranty.

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 01, 2011 | Malibu ML200RT - Low Voltage Power Pack...

1 Answer

How do you set lighting to turn on and off throughout the day?

You posted under Malibu power pack.
If you have analog dial that rotates as time passes, then setting on-off times is accomplished by using black and red tripper.

Usually the timer comes with 2 red ON trippers and 2 black OFF trippers.
Place trippers on outer edge of dial and then set timer according to instruction manual.

If you need more trippers, they can be ordered

Open following link if you need instruction manuals or troubleshoot steps for setting up power pack.

Add a comment with exact model number if you want more detailed instructions, and add your experience so others with same-similar problem can benefit.

Also 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.

Apr 05, 2011 | Malibu ML200RT - Low Voltage Power Pack...

1 Answer

I just purchased Malibu ML 600 TW transformer, and ran wire and attached lights, but I can't get any of them to work. Perhaps I'm wiring it incorrectly? How do I test the transformer to see if it is...

Malibu website
Malibu manuals

The power pack has a humming sound >> put your ear close
Plug in a hair dryer on same plug to see if you have power
Check the GFI tripper in bathroom and kitchen
Plug power pack directly into receptacle (no extension cord)
It is hard to believe you got every light wrong >> the light connections are pretty fail-proof today

1) You can test the transformer by rotating manual override counterclockwise >> that's the on-off switch
2) You can test transformer by seeing if clock dial rotates with passing time > the clock must rotate
3) You can check if wires have power > disconnect wires > use another wire to scratch across both terminals to see if there is a spark

4) Did you put the red-and-black tripper pins on the dial? Red = ON Black = OFF

5) I think you forgot to set the time of day correctly
- put in tripper pins.
- rotate center dial clockwise to present time
- now, rotate dial two more full rotations and come back to present time

If the dial will not rotate or transformer does not have power, then the transformer is defective.

Oct 09, 2010 | Malibu ML600TW - Low Voltage Power Pack -...

1 Answer

Clock turns untill pump turns on then stops. does c8866 timer work with well control box?

If I understand correctly, you are controlling 240V water well pump with Intermatic C8866 Repeat timer.

So you must be using pump to irrigate, and want to turn pump on at certain times of day for short periods ... and want this schedule to repeat continually non-stop.

1) The c8866 repeats the same program every 4 hours so this is good choice for irrigation and it just turns the circuit on-and-off so it works fine with well control box (unless you want more complex programming).
Many types and prices of cycle timers
More cycle timers

Let me give a buckshot answer and see if I hit one of the targets you have.

2) C8866 according to manual:
a) You have on-off trippers
b) First ON tripper turns on load for 32-40 seconds
c) Each additional ON tripper will lengthen ON time by 30 seconds

3) To lengthen ON time: add successive ON trippers into dial. Each successive tripper adds 30 seconds. Let's say you want ON time to be 3 minutes, you need 6 successive ON trippers.
Maximum timer setting is 240 minutes, so your ON-OFF program repeats every 4 hours.
10 Tripper pins come with timer.
Buy more pins at Grainger for 2.69

4) Did you say the clock stops running after hitting the tripper? If so, maybe you need a bit of grease on the pins ... or a new clock motor? Buy clock motors at Aplus
5) Review the wiring
Hots from Breaker connect to COM and CLOCK poles
1 Hot to Load connects to NO normally open pole
Other Hot to load connects to CLOCK pole

6) You can reverse ON-OFF programming by the following:
Change Hot to Load from NO to NC pole and this will reverse on-off programming

Oct 02, 2010 | Hardware & Accessories

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