3-4-5 will work.
Tune the 5 to G
Tune the 4 to D
Tune the 3 to g
What are the string gauges? Usually somewhere @ the mid to low .40's .30's .20's should work, at least so long as your scale isn't unusually long or short...
If you know the scale length of your instrument and you know what note you are looking to get, you can use this:
Enter the length, the note of choice and click "calculate". It will tell you what size you need for that note. Repeat for all strings.
i tune GDG for 3 strings and GDGb for 4 strings, string gauges i found work the best are 32, 24 and 16 for 3 string and 32, 24, 16 and 13 for 4 string, Ernie Ball highly recommended! (-:
Thanks for the info. I was using the bottom four and that was my problem. I will try 3, 4 and 5 and see how it sounds.
Think of it in terms of logic, you want to pick the strings that are closest to the tuning you want to use so for G-D-G you want to pick the A, D and G strings (5th, 4th and 3rd from a pack). Then you only have to drop the A string down to G and the other two are tuned as expected. Any other strings will mean either too much tightening or strings that are far too loose.