Any Electricians in here that could maybe answer a question

Yes I thought of that also and its fine. Even changed out the pull switch.

Check the polarity

I checked that also. Its really got me puzzled as to either bulb will work by itself but not when both are screwed in together.

you sure its not the switch ... 1 pull (assuming its a chain pull switch) 1 light on, second pull both lights on.

Does the fan work all the time?

yes, its a simple 2 wire switch and I replaced it.

No, I can turn the fan off and on with the second pull switch.

Corrosion or a bad wire nut connection is limiting the amps to the bulbs. Find the bad spot in the wiring.

OK will try that. Thanks

Just replaced a duplex outlet at a friend's house causing all kinds of crazy, seemingly impossible problems. Outlet crumbled when he pulled it out to look it over. Bingo! Crazy daisy-chain wiring throughout the place. One outlet replaced solved everything!

If its a dimmer switch could be the fuse is not providing enough amp

That's because the polarity is being reversed between the bulb connections. Probably a wire shorting out somewhere. Got a make/model of the fan? Usually a stamp somewhere.

Ceiling light went on flashing when switched OFF, but not on in ON position. 1200 watt heater worked fine but disabled everything else in room. 1 outlet in the wiring "daisy-chain" caused all the problems.

Sorry, I mean does the fan turn on even when you have bulb problems? Have to tried turning fan on when two bulbs are in and you try to turn on?

Bascially try turning fan on in every scensario, one bulb in and off, one bulb in and on....two bulbs in and off....two bulbs in and on etc.

You probably already did, but just in case.

Check the VOLTAGE in each socket; with one socket empty and the other bulb on, and vice versa. That should tell you a lot.

I never looked at the wall switch. I will check that out tomorrow as well. I still don't understand why one bulb will work by itself in either socket. I would think its getting enough power but that's why I am here--i'm not a electrician!

If the voltage drops in either socket, it's a lack of amps getting to the main light feed wire

Yes sir, tried that also but thanks for the input.

Again, Voltage in lamp sockets will tell you where to go next. I'm an electrical expert and have never encountered a problem I couldn't solve.

Do you have a multimeter? Any cheap one is fine. THERE HAS 2 BE 110-125 VAC on both bulb sockets at the same time.

will check tomorrow for sure. Thanks.

Might also be the center "tabs" that contact each bulb bent down a little too much. Turn off power and bend them up a little.

This guy's right OP. First you need to learn how to read electricity. You do that with a tool called a voltmeter. Get the additional leads that are micro-clip on sort of thing, they are super handy. Test the voltage in each socket as described. Without having the right tool, you may as well be fumbling around with a wrench on some bolt. Of course there is a whole school of mechanics and power people who make it their hobby to do everything without a specialized tool, but in the case of electricity, you need to know how to know what's going on. We wouldn't need as many codes, in society, if the people were more able.

Yes I have one and will check this out tomorrow. Thanks for all the help everyone.

Free meter at harbor freight with a coupon and any other purchase.

It could be improperly wired so when both bulbs are plugged in it shorts out.

no, its been working fine for over a year. this just happened yesterday.

My bet's on wire nut/crimp connecting black socket's wires together, or to the switch, or socket's white wires. CHECK INSIDE FOR PROPER WIRE NUT TWIST.

If only a few fine strands of one wire are connected it will limit the amperage flowing to the bulb sockets.