RE: How to convert an ATX power supply to rc use
If your DELL powersupply was manufactured between 1996 and 2000, there is a high probability that the PSU is one of the DELL proprietary supplies and that it will not conform to the INTEL Design Guide standards.
The pinouts (colors) that were used in this time frame are:
GRAY -- PS_ON (power supply on) equivalent to ATX standard GREEN. This should be switched or hardwired to GROUND.
BLACK -- ground plane (the same as ATX black)
RED -- +5v rail (the same as ATX red)
YELLOW -- +12v rail (the same as ATX yellow)
Tie the GRAY to GROUND (BLACK) through a switch or hardwire it.
Pre-load the +5v rail with a power resistor (RED to BLACK). Use the highest ohm rating that will give you a satisfactory voltage level on the +12v rail.
Your charger connections (binding posts) will be YELLOW and BLACK.
andrew