usa1racing

I'm wiring my 88 Camaro from scratch, using the stock 4-wire alternator. The main power wire goes directly to the battery, the smaller red wire on the plug, also to the battery. The brown wire, post "L", is not hooked up because I no longer have a voltmeter. The tan and white wire, post "F" is what I believe is giving me the problems. From what I've read, the tan/white wire needs to show the alternator 0.5 Volts less than the battery while the car is running. However, mine only shows a 0.2 Volt difference. Since the car no longer uses the factory harness, I can't make use of the F/P/Fan/Choke Heater circuit in the fuse box. I'm thinking that the 0.2 Volt difference is not enough to make the alternator start to produce a charge. Please help.

usa1racing

Tan and white wire is still not seeing 0.5 volts less than battery voltage while running. Battery is 12.6 volts across the terminals when not running. Battery jumps to 14.5 volts when running. When I disconnect the battery, the car dies, so obviously I'm not getting a charge out of the alternator. I've read in posts to wire a 27.5 ohm or 33 ohm resistor into the tan/white wire to step the voltage down 0.5 volts in order to get the regulator to make the alternator start charging. Does anyone know the amperage draw of the tan/white wire? Using Ohm's law, with 27.5 and 33 ohm resistors, and a difference in voltage of 0.5 volts, the amperage draw appears to be 0.018A and 0.015A, respectively. If I knew off hand the amperage draw, then I would be able to select the proper resistor to produce a voltage drop of 0.5 volts.