CompuServe Thread

Khalid, when the red light comes on, does the drive actually spin? The +15 is the one that runs the motor, and it could be that the 5 volts is lighting the light, but that the 12 volts is not even being passed through. This could also be the cause of the light glowing dimly, as some parts of the circuitry could be left in a funny state due to the lack of 12 volts. Since you say that it didn't work the first time you tried it, and that you got around it by reversing the order of the two drives, then this will be the problem. The seconddrive in the string, (and probably the last one too) do not have the 12 volts passed through to the next drive. You really have two choices in order to make use of all 4 drives. One is to buy a small 12 volt power supply and wire it in to the last drive. The other is to wire the 12 volts right on through on the second drive itself. Please don't attempt this if you don't feel comfortable around a circuit with a soldering iron, and without a thorough double check of the pinouts vs. voltage readings with a meter.