On 11/23/2013 1:59 PM, Danny D'Amico wrote:
On Sat, 23 Nov 2013 12:29:02 -0600, The Daring Dufas wrote:

That module attached between the battery and the panel is a battery
saver module.

You are correct! I had thought it was a "power supply" but it's not.
A sticker says it's a "D135A low battery disconnect", which is
apparently supposed to be sticky-taped to the top of the battery.

Googling, it's a 9.5 volt cutoff (as you said, to save the battery
from a deep discharge). I'm surprised you could tell that from
where you sit, because I only just realized that myself now.

The panel will work without it and I believe it's shorted
out and is what blew the transformer.

You seem to be familiar with this stuff but I must ask:

What is the "it" in the sentence above? The battery?
Or the low-battery protection board?

I would remove the module and hook the panel's power leads
directly to the battery.

Before I do this, may I clarify the suggestion?

Should I remove the D135A low-battery protection board, and then,
connect the battery directly to the black and red power leads of
the Radionics D2212B (LT) circuit board?


"It" is the low battery disconnect. Connect the power leads you remove
from the D135A directly to the battery to see if your system operates.
I haven't worked exclusively in the alarm industry for many years but I
would get into alarms from time to time. Your alarm system is at least
21 years old. The date code on the small round bridge rectifier on the
circuit board looks like it was manufactured in 1992. ^_^

TDD