Okay, on my other post i'm having problem getting power to my ballasts after installing diodes to my positive line.
Does anyone know if a 93 Prelude uses ground switched headlamps? If so, what affects could this be to my diodes installation? Would i need the current to go reverse or maybe i need on my negative cable?
If your headlights were ground-switched, then the low beam and high beam wires would rest at +12v, but the diodes wouldn't keep this from working. If they worked before, and you're sure the diodes are installed properly, check your fuses, and relays. Then try another diode. If that doesn't help, and you've checked your wiring, there maybe a problem in the factory wiring. It maybe best to wire your harness from the m/f switch, or bypass it all together.
If you have ground-switched headlights, I'd think the current is running backwards in the wires. Did you try reversing the diodes or get readings at the headlight sockets to SEE if you have ground-switched wiring?