September 9, 2009
MGK, first, check fuse #6 in the battery compartment fuse box. It is a 10 amp fuse. If in doubt, replace the fuse. Once you get a good fuse in there, look at the 2 wire plug on the side of the alternator. one will be an orange/light blue wire, the other a red/light green wire. I want you to connect up the multimeter to the orange/light blue wire (red lead) and ground (black lead). Are you getting 12 VDC there (assuming you are not getting 13+ VDC now with the new fuse)? If yes, then that confirms a bad alternator (assuming the plug is good). If no, then you have a bad wire between the alternator and the fuse box.
If you are thinking a bad wire, first check the plug is good by unplugging the 2 wire plug and checking for 12 VDC on the terminal for the orange/light blue wire and that the plug appears in good condition. You can then install a temporary wire between the live side of the fuse (or the positive of the battery, but only connect up once the motor is running) and the terminal that the orange/light blue wire would have been connected to. This should cause the alternator to output 13+ VDC. If it doesn't, then you have confirmed a bad alternator.
Hope this gets you going on down the road again.
Chris "Thermo" Coleman, Nukie the radioactive 97 Ford X, and K'Re Ann the 03 Jag X