Alt. guage discharging all the time???

The very quick check is to unhook the green field wire at the alternator and ground that field terminal on the alternator. See if it charges.

If not, be sure that there is power on the blue field lead with key "in run." If so, you should be able to hook/ unhook the temporary ground on the other field terminal and see a small spark in low light.

If it won't charge, likely a bad alternator.