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Iff you use a light bulb as a test indicator, you should not have to worry about blowing any fuses.
On the tow vehicle, run the lightbulb as suggested with one lead attached to the vehicle ground. Activate each circuit one at a time and see which pin causes your bulb to light to identify the pin connections on the tow vehicle.
On the trailer, connect one end of the light bulb tester to +12. Connect the other to each trailer pin one at a time and see what lights up. In most cases, you'll get a dim light as the indicator bulb and the trailer circuit are in series (protects fuses) but you should still be able to see which trailer circuit is connected to what pin. You can check for brakes by getting a wheel off the ground and spinning it to test if the brake is activated. If you can't see the bulb light the first time around, then you can try +12 to that pin to brighten things up a bit (but this hazards fuses).
Standard wiring goes somewhat like this
1- white - ground
2-brown - right turn/brake
3-green - running lights
4-red - left turn/brake
5-yellow - brakes
6-black - backup lights
7-blue - battery
The color code seems to be rather well followed.
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