Transformer AC 9 Volt, battery 4x 1.5 Volt DC. On

Halogen work with AC or DC voltage ... 12 volt LED bulbs are DC.
Check that transformer delivers DC, or buy 100 watt IP67 LED driver.
Keep in mind the lutron DV-600 is rated for incandescent and halogen loads, and may not function as expected when connected to inductive load like transformer or driver.

Yes, you go through a converter.Check the attached links,
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DC AC Power Inverters 12 Volt DC to AC Inverter

12 Volt DC To 110 Volt AC Power Inverter for Auto RV and Boat compatible...

You smoked off the regulator , a transformer is for AC voltage change like say a step up or step down and the trxfmer just shot AC voltage to where DC should have been. The bridge rectifier is what changes the AC to DC not a transformer . If you have soldering skills you can replace it on the board , it could be you just cooked off a diode (1 of 4 to make bridge) . Hope this helps

Hello jmanis

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

The bulbs for low voltage are labeled 12Vac

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

This is a step down transformer for the DC supply to the board and processor. You can check on the DC side and if the main capacitor is 16 volt then it can be a 9 volt tapping or if this is 25 volt it can be a 12 volt one. The important fact is to have the size that fits into the slot which can confirm the mAmps required for the transformer.

Yep. Plugging a 9 volt transformer into a 6 volt device wil recked er up ... so would using a 9 volt DC in a 9 volt AC device. Test the power supply before you trash it. Make sure it is putting out what it is rated to put out.

Thanks for visiting today.

Are you referring to an inverter by a "power box"? That term doesn't really describe the device. I'm going to assume it's an inverter you're talking about, a device that takes DC and turns it into AC. I'm not sure about that, but you should be able to plug a converter (turns AC into DC) of the right voltage, 12 to 14 volts DC into a generator on the boat and run it. I'm assuming the trolling motor runs off 12 volts DC and NOT gasoline. Be sure to check that before doing anything. Most do run off a large car or RV battery. Lead Acid Batteries for boats and cars produce 12.7 volts DC if they are in good shape and should have six cells (about 2volts per cell). 6 volt batteries are somewhat rare these days and have 3 two volt cells. Two of them in series will also power it.
Thanks for asking that question ... I like to fish also.

Lynn

I'm gonna bet the output is AC because there is no rectifier circuitry between the transformer and the timer assembly. The lighting this is supposed to power does not require DC so why put in the circuitry if it is not needed. So more than likely it is 12V ac

you need a voltage doubler circuit which feeds from your 6V DC system and converts it to AC and steps it up and converts it to 12V DC. This device might be difficult to find. OR use a 6Vdc power inverter and just use a 120volt AC fan if much easier to source out in your area.
You might want to try a 12VDC high speed fan and see if the 50% reduced speed is already sufficient for you.