I have an inground pool I just upgraded from SaM lights to LED. I used Pentair Intellebrite 5G LED lights with my Pentair EasyTouch 4 system. My two pool lights are 12v and the spa light is 110v. I'm not sure what I did but the GFCI trips when I turn on the pool lights but works just fine when I turn on the spa lights. The pool lights aren't even wired through the GFCI. The pool light has a black wire going from the relay #3 to the 100watt transformer. The white wire is coming from inside the Pentair panel, not the GFCI, straight to the white on the transformer. The output on the transformer goes to the wires for the pool lights. The spa light is run off relay #4 and does go through the GFCI for the white wire. I hope this makes sense but I can give more details if needed. The only connection anywhere close to between the two is the jumper wire running from relay #3 to relay #4. It's the feed and not in anyway connected to the GFCI but who knows. I'd appreciate some advice.
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