LED powered by a negative source?

[stoneattic]

I have an amp that had a power indicator LED that I accidentally broke physically when trying to relocate it to make room for a master volume. I tried to replace the LED but the power supply to the LED is negative. The two pins are -18.8v and ground. How do I wire an LED from a negative source? Where dose the resistor go, between the -18.8 and LED or from the LED to ground?

TIA!

[Jazz P Bass]

LED polarity

THe anode (the longer lead) always goes to positive.
The cathode (may have a flat on the side of the lense) always goes to negative.
In your case, Ground is positive.
-18 volts is negative.
The current limiting resistor can go on either side. It does not matter.

[stoneattic]

Thanks for the response.
I wired it up as you suggested and it works. I put the resistor between the (positive) ground and the LED. It just seemed like the right way to do it.