If you read good voltage at a point, and have a good ground, but yet it wont power anything, that means that their is a "high impedance" (resistance) "upstream" of where you are measuring it. Basically a loose connection, bad crimp etc. Basically there is enough current getting through to power the meter (since it doesn't use any power from what it is measuring) but not enough can get through to power anything. This is just general advice that may or may not apply to what you are doing. Another way to verify this (and a good test to always do in these situations) is to measure the voltage with the load CONNECTED. You will probably see it then go to 0. This is your hint to go look for a bad connection somewhere.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra