I have power to my Malibu Intermatic Inc. 158ML 13251, and am able to set the mode to o, the sensitivity to 1, but I don't seem to have power to the lights. It checks well on a 12V tester...

SOURCE: I have an intermatic/malibu low voltage outdoor

I think you can add any Malibu 12V lights rated for the 300 W power pack. Make sure that the total output stays below the 300W limit.
http://www.malibulights.com/ and click on Products and the different available lights will be detailed with the voltage and wattage.
You just have to click on the category, then the specific light and Product details.
This tier light would be acceptable http://www.malibulights.com/Products/Detail.aspx?category=Low+Voltage+Lighting&subcategory=Tier+Lights&sku=8301-9200-01&series=TIR-2009-1&seriesname=Cast%20Metal%20Tier%20Light&id=195

This flood light can also be put on the system
http://www.malibulights.com/Products/Detail.aspx?category=Low+Voltage+Lighting&subcategory=Flood+Lights&sku=8301-9602-01&series=FLD-2009-2&seriesname=20W%20Cast%20Metal%20Flood&id=206

I hope this helps.

Cindy Wells

SOURCE: 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.

SOURCE: Describe your Inc. ML121RT Malibu

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:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

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.

SOURCE: malibu 8100-0300-01

Promoters should include useful information. Not just air-head fluff.
Copy following link for actual useful do-it-yourself information such as warranty, troubleshoot, operation tips, manuals.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Instant Repair Help over the Phone

6ya.com

Save Time & Money by instantly connecting to...