T5s come on for 3 seconds then off

[High tide]

Sounds like your ballast is shot.

[BlueWorldAquatic]

More than likely the ballast. Could be the bulb too, did you try other bulbs?

Possibility of it being a solder connection or ground too

[bryceschutte]

Long story short i got my end caps wet and they did the same thing. I waited till the where dry and it fired right up.

[martinmcnally]

It seems like they got wet and I think some salt got in there. I remove the bulbs put them back in and it works fine. However it happens everyday now. Tried cleaning everything out of the end caps but its a nuisance now. Everyday I have to remove the bulbs and put them back in to get it to work.

Its a Tek light fixture 36" x4

[RuGlu6]

happens sometimes to T5's most likely loose wiring.

[BlueWorldAquatic]

Originally Posted by martinmcnally

It seems like they got wet and I think some salt got in there. I remove the bulbs put them back in and it works fine. However it happens everyday now. Tried cleaning everything out of the end caps but its a nuisance now. Everyday I have to remove the bulbs and put them back in to get it to work.

Its a Tek light fixture 36" x4

Get some electronic contact cleaner from canadian tire. Spray liberally and should solve you problem. Or you can just replace the endcaps.

Ken

[The Grizz]

Does your light have an acrylic cover on it to keep moisture out?