When I first turn on lights , low beam will come on for a second or two, then go out. Also moisture in light, didn't know if this would have anything to do with light not working. Repairman said it was a bad ballast.

 

welcome to the forum
you have a compound problem:moisture is getting past a bad seal on the headlight lens.

you can replace entire housing- about 100 each aftermarket, or reseal yours DIY with some effort

after that fix stops moisture entry,,it will stop dripping out the bottem and directly onto the ballast-the non-waterproof ballast!! causing its failure,,,maybe pop a fuse along the way

best way we have found to fix, is a complete HID kit from hidextra.com or hidconcepts.com- both members here and give us a discount

Just got mine and will be glad to have 2 headlights at all times again!
came with 2 waterproof ballast- 2 connector wires light to ballast and 2 HID bulbs
(under 80-100 bucks complete!!!)- look for coupons online or ask for ziner discount)

 

here is our diy list for resealing the housings, and much more for your TL
https://acurazine.com/forums/2g-tl-1999-2003-98/new-official-2nd-gen-tl-diy-thread-706083/

 

yea mine did the same thing i took off the headlight opened it up and took the water out and the hid started to work again there was water everywhere make sure to check the connectors mine was wet

 

someone recently took apart the old ballast to show the damage water did to its internals--not pretty