[PSUscaper]

It's hard to really help without seeing the system.

I'm trained with multi-tap transformers, so what your saying sounds a little out of wack already.

I'd first start off simply by counting the number of lights and the watt lamps in each of those lights going to the transformer. If the total wattage is over 450w combined, that could be the first problem, especially if the lights are far away from the transformer.

After that, you really have to start getting involved. First thing is going to be a volt and amp meter to start doing some testing. There are general guidlines too follow, that need to be followed. You may also consider testing the transformer first to see if it isn't damaged from being overloaded.

A simple way to test the transformer is to take a light and wire it up and see if the transformer works at all......if it doesn't light up one, then it probably is fried.

Diagnosing a lighting system is very time consuming and tedious work.........you never really know what is going or what has been done. Ask if the lighting system was ever changed after the first initial setup. Many people think you can just go ahead and 'throw' a few extra lights on to a existing system and not have any worries. If the system was maxed out to begin with, and then a few more lights were added on/higher wattage lamps were added, problems occur.

Many, many problems to be determined. As someone suggested, the first step should be to get a book/or get signed up for alighting class asap so you can at least get a grasp of the basics of low voltage lighting.

At this point, my best suggesting would be to get a experienced lighting guy involved to come in a take over. It's starting to sound like a real nightmare that you may not want to get involved in.