Can't install 4th motion detector

[jeff black]

Security system model DS7000 with 3 door
switches and 4 motion detectors. I
can Install the 3 door switches and 3 of 4
motion detectors, the system arms
ok. But when I add in the 4th motion detector
I can't arm it. I tryed
installing each part one at a time and arming
the system but when I get to
the 4th motion detector the system won't arm
gives off a repetitive trouble
alarm. Any Ideas? Thanx...

[john brown]

I have a Radio Shack 49-1000 and when trying
to install the 4th door/window switch or 3rd
motion detector, the system does not
recognise it or it shortly displays as a
trouble zone and then the console ignores it
entirely.

[andrew]

I have the radio shack model as well. I have
9 door/window and 3 motions sensors and it
seems to work fine. only real problem is that
it wot trigger the powerhorn...