First off a better group for this questions would be comp.dcom.cabling,
however I'll give you an answer to you question here.
A tone generator is exactly what you need. You should be able to pick on up
for a reasonable price at Home Depot or Lowes or any other larger home
What you going to do is plug the sending unit into the jack at the wall and
then use the receiver to locate the wires at the block. Now remember that
the sending unit will only send tone down the line one pair (usually blue,
blue/white) but once you find that pair is should be easy to locate the
actual cable and find the orange pair and where it's punched down.
If you phones were wired correctly for two lines than you should see a
pattern on the 66 block something like b, b/w then o, o/w repeated down one
side of the block. Your b pair is line one and the orange pair is line 2.
This assumes that the cable is CAT5 4 pair cable. If your cable is 2 pair
then its most likely R, G for line one and Y, B for line 2.
You'll want to make sure that your second line is punched down and then
jumpered over to you jack runs. If line 2 is dead on all jacks then I'd
suspect that it isn't punch down on the block at all. If dead on only a few
jacks, say the ba*t, then I'd suspect that when the ba*t was
finished only line one was jumpered on the block for those new jacks in the
> I don't know if this is the right group to be asking this question in,
> but perhaps someone can help me out.
> I have a rats nest of phone wires converging on something called a
> "66B4-B Jumper Block" down in my ba*t. I have phone jacks with
> 4-wire line at various locations in the ba*t, and I can only get
> one line to work although we have 2 lines in the house. I bought a
> little LED tester that plugs into the phone jack, and it checks for
> crossed wires, whether there's 2 lines present, and other things. I
> suspect that something is screwed up at the jumper block because it's
> just too easy to snag a wire there out in the open and pull it loose.
> Rather than calling in the phone company, or spending $100 on
> something called a tone generator, is there any cheaper way to find
> out what's wrong with this line?
> And if a tone generator kit is the only answer, can anyone tell me
> where I can get the bare minimum unit new or used?
> Thanks in advance for any/all help.