said by Scelana:
I might be able to connect the modem to the test jack but I'm gonna need more than a 25ft cable cause my modem is upstairs and the phone box is outside on the lower floor opposite of the window of the modem's room. I'll see if I can do that and post about the results if I can find a long enough cable.
An alternative if you have a laptop, or wifi is to take the modem and laptop or router out to the box and use an AC ext cord for power.
If the jack/wiring is that ancient as you describe that well may be the problem.--