Curtis Faith published them somewhere on the internet. The short version is you're buying (selling) N day highs (lows) and trailing a x ATR stop. Use the ATR of each instrument to come up with position sizes so that each trade has the same dollar volatility.
A few former turtles will be happy to sell you the signals if you can't come up with them yourself.
I would suggest if you don't have the time to generate the signals yourself, that you shouldn't be trading it yourself either. There are a number of (relatively) low-fee ways to get exposure to long term trend following systems, like AQR and Longboard managed futures funds. Rolling your own, it's hard to trade enough markets unless you can allocate 500k to it anyway.