I just installed a 4 bulb light fixture in the grage (110V) using a 4 bulb ballast. The problem I'm having is one bulb doesn't come on. I've changed bulbs and still the samething. I'm thinking it probably the ballast. Any ideas? Omar

If your garage is cold and unheated this may not be the right fixture for you. If it is brand new I'd take it back and not start repairing something that was broken in the box.

If the ballast has a single output for all 4 bulbs, likely the problem is a connection to the bulb, maybe even the socket. Even if it has separate outputs, it still could be a bad socket. I love my voltage detector for such problems. I can check the wire to the non functional light just by touching it.

To do simple checks like this you do need some tools. A test light, a meter, or a voltage detector might be the best place to start with. I came across the niftiest gadget for trouble shooting, a voltage detector. They work through the insulation of wires. There are several brands. I have a GB Instruments GVD-505A, less than $15 at Home Depot. Touch it to a hot wire, and the end glows red. Find the doodad that lights it on one side, and not the other, and you have the culprit. You do not have to open up housings and expose electrical contacts. You are looking at where your hand is, not where the meter is. Most people are capable of doing repairs and will get it going and not get hurt if they use a little sense. The voltage detector makes it even easier.

i just installed a 4 bulb light fixture in the grage (110V) using a 4 bulb ballast. the problem i'm having is one bulb doesn't come on. i've changed bulbs and still the samething. i'm thinking it probably the ballast. any ideas? omar
If it's a new ballast you installed in an old fixure you might want to check the wires going into the socket of the lamp that isn't coming on. They have a tendency to come loose or wiggle their way out sometimes. If that is the case, it's best to get a new socket for the fixture. But if it's a brand new fixture you should just take it back where you bought it and get a new one. I usuallt test a new ballast in an old fixture on the bench before I put it up with a cord. That way I don't have to mess with it on the ceiling if something doesn't work.