Take a look at the interconnect board, J6 plug, (all the wires are either solid yellow, or yellow/white) That is you incoming power for your general illumination lamps.
The interconnect board is the long, narrow board located at the bottom of the backbox. The J6 connector is located on the far right side of the board.
These connectors almost always are burnt and/or hacked.
Replace the old crusty IDC connector with a new Molex version. Also go with trifurcon terminals in your molex connector. When looking at the J6, you'll notice it is a 9 pin plug, with the following wire connections:
pin 1&2 jumper-ed...(meaning, the wire is "looped" from one pin to another).
pin 3&4 jumper-ed
pin 5 key
pin 6&7 jumper-ed
pin 8&9 jumper-ed
When going with a Molex connector, you can't "loop" the wires from one terminal, to the next. You "could" try to crimp 2 wires into each trifurcon terminal, but trust me, you don't want to go that route, it's a PITA to do, and is very unreliable.
Here's what I do on all system 11 J6 connectors:
1st off, mark all of your connectors on the interconnect board as you un-plug them.
remove the board
Inspect the header pins on the J6...replace if corroded or burnt up..(I almost always replace)
Whether you replace the header pins or not, you will want to re-flow the solder on the back side of the board, adding new solder. While doing this, continue to add excess solder so that create a "solder bridge" between the following pins:
The reason for this?....you just created a new "jumper" basically, the same thing you see on the jumper-ed wires, only, in this case, you're using solder.
But creating the "solder bridge", you just made the molex connector build a lot simpler. Now all you have to do is crimp one wire into each trifurcon terminal...a total of 4.
When building the new molex connector, I always install the key. The key is usually in place to make your plug connections idiot-proof, meaning you can't plug it in upside down, (reversed). In this case, since pin 5 is keyed, meaning even if the connector is keyed, it's still possible to plucg the connector in reverse...but DON'T try this...you can cause damage.
When you crimp the wires to the new trifurcon terminals, do this one at a time. Clip one wire, strip, crimp, install in to molex connector...Star w/ pin 1. Once crimped, install it in the pin 1 opening of the connector. Continue on to pin 3, clip, strip, crimp...install into #3 opening on the molex. Continue on to pin 6, clip, strip, crimp, install in opening #6. Continue on to the last wire, (#8), clip, strip, crimp, install into #8 opening....you're done, and ready to re-install the board.
The reason J6 is usually burnt/hacked is this:
Electrical resistance causes heat build-up. There is a lot of electricity continuously going thru this connector.
When looking at the header pins, you'll notice the pins are square. The old IDC connector terminals made contact w/ only one surface of the square pin.
By going w/ trifurcon terminals, you are now making contact w/ 3 surfaces of the square header pin, that's what the trifurcon terminals are designed to do.. Better connection=less electrical resistance=less heat build up.
By doing this "upgrade"...you'll never have a problem w/ the J6 again.