Aquarium lights and fan

[enli]

Two lights that are each on a separate switch, black & white wires for each light. One fan, black and white wires. Fan is wired to come on when switch for light #1 is turned on. Light #2 switch only turns on light. Is it possible to rewire fan to come on with either light and with both lights on? It is desired that fan is on if either light is on and also if both lights are on. Switches have only two connection points per switch. Just don't seem to be able to get me head around this without buying new switches that would have 3 way capabilities. Thanks, Enli

 

[Bluejets]

DC or AC..?
low voltage or mains supply..?
3 way switch..?? think you mean 3 pole switch....either way a 2 pole single throw on each would do BUT it depends on the above..

 

[enli]

It's all 110ac, switches actually control the ballast for lights and the fan circuit goes to transformer that lowers voltage to 12v for small fans. Two incoming 110v power circuits are available, or could use a single power circuit. Lights are 18watts each and fan is small 12Volt-2/10s (.2) amps

 

[Bluejets]

2 options .................

 

[enli]

Thanks BJ, switches in top diagram would be double pole, single throw? What type of relays would I need for 2nd diagram?