Malibu ML600TW - Low Voltage Power Pack - 600 Watt - With Timer and Ground - Page 4 - Answered Questions & Fixed issues

has it been run flat out or over loaded? if so its the switching transisters burnt out

If the bulbs turn on when you manually rotate dial, then the power pack has electricity.
A lot of people ask for replacement Malibu tripper pins on Fixya, and it sounds like your trippers are working fine.
If clock has stopped rotating, that means the power pack has malfunctioned, and needs to be replaced.

I did find some tips to help folks preserve their power packs:
1) Match wattage of bulbs with wattage of power pack
-15 each X 20 watt bulbs = 300 watts, so install 300Watt power pack
2) Installing a 500W power pack on 300W of bulbs will burn out bulbs and power pack.
3) Replace bulbs as soon as they burn out or other bulbs will burn out and power pack will burn out.
4) 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

I answer questions for free.
I specialize in timers and electrical devices.

Below is link going to malibu.com manuals
http://www.malibulights.com/customer_service/owners_manuals.aspx
If you have a problem with the manual, get as far along in the manual as you can, and then add a comment at bottom of this post and I will help

Below is link going to a guide for setting up your malibu lighting
http://www.malibulights.com/guides_support/low_voltage_planning_guide/select_your_power_pack.aspx

Let me save you some money:
1) Match up wattage of bulbs with wattage of power pack:
15 - 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 power pack.
2) Replace bulbs as soon as they burn out or other bulbs will burn out and the power pack will burn out too
3) When working on bulbs, unplug power pack or the power pack may burn out

If you need more assistance, add a comment and I will answer

Below is link going to malibu.com manuals
http://www.malibulights.com/customer_service/owners_manuals.aspx

Below is link going to a guide for setting up your malibu lighting
http://www.malibulights.com/guides_support/low_voltage_planning_guide/select_your_power_pack.aspx

Let me save you some money:
1) Match up wattage of bulbs with wattage of power pack:
15 - 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 power pack.
2) Replace bulbs as soon as they burn out or other bulbs will burn out and the power pack will burn out too
3) When working on bulbs, unplug power pack or the power pack may burn out

If you need more assistance, add a comment and I will answer

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.

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.

Malibu website
Malibu manuals
Select your power pack guide

On the manuals page, I see 600 Watt power pack Model 8100-9600-10
May not be exact manual, I bet it is close

You can go to the Intermatic web site;
http://www.intermatic.com/
Click on customer service and then the tripper order form
or try this direct link to the form:
http://www.intermatic.com/~/media/Files/Intermatic/Other/866%20tripperorderform_6%2014%202010.ashx They're only about 10cents each so buy pleanty.

http://www.northernlighting.com/Malibu%20accessories.htm
Scroll to the middle of the page.

Routinely vailable on eBay...sometimes listed as "Intermatic" (Malibu's parent company.).

All Manor House low volt transformers are 12 volts AC only :-(

Yes, using a larger wire will help, as will using more than one run. If you want too, you can leave the 16 gauge wire in place, then run the new 12 gauge wire and transfer most of the lights to the new run.

The fewer lights on a run, the less dimming will occur, so put more lights on the 12 gauge run.

Also, the longer the run, the more dimming will occur.
You may want to reconsider the location of the transformer, if possible. In your case, it would be better to locate the transformer in the middle of the current run, and just split the run in half to make a run in each direction. Of course, that depends if you have a 120 volt outlet available in that area.

The small motor that runs the time clock is bad. If it stops the motor when it comes to the start and stop clips, it's done. Replace it. If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

there are multipul 12 timers on the market BUT if you use a 12 volt power pack designed for a car radio display or even a simple 12v 5 amp laptop power suply and a cheep outdoor timer or cheeper indoor timer and run wires inside you can add lights
remember theise lights are low voltage and if you change the bulbs out you can really strech out the amprage too
low amp led automotive bulbs are a great invention they draw mili amps and use 12 volts
i converted my noma moonrays to a laptop power supply and added 30 more to a single string so i curently have 50 lights on 1 power suply pulling aprox 4.5 amps out of a 5A power supply i used led bulbs and simple moma cord now i can light the whole back yard with 1 ps and it's really bright if i use the led headlamps mounted under the soffit on the house

Check for a loose connection where the problem "loop" connects at the tranformer.
Also, swap the "loop" connections to the tranformer. If the problem still persists replace the wire run. Sometimes wire gets damaged internally and visual inspection will not reveal that.
If the problem occurs in the other loop after the swap, then you probably have a bad connection inside the transformer. If that is the case, you won't be able to use that connection as the transformer has no user servicable parts.
Also, if the tranformer in under 5 years old, it's still under warranty.

Check the total combined wattage on the tree light circuit. You may be exceeding the wattage limit on that part of the circuit.

Are you using the red peg for 'on' and black for 'off'? If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

If it is keeping time try moving the stops. If it is not keeping time the motor is probably burned out. These transformers don't have a lot of serviceable parts to them.

Turn on the power pack by twisting the manual ON/OFF knob counter clockwise to the ON position copy and paste https://www.1000bulbs.com/pdf/intermatic-ml44t-installation.pdf ..

copy and paste https://manualzz.com/doc/en/24311737/300-watt-power-pack-8100-0300-01---smarthome