I checked out your controller. I replaced the cigarette lighter plug with one of the ones I had, and added an external fuse holder and fuse. The beeper is functional. One of the screws holding it in and making electrical contact had stripped out, so I hot glued it back in place and that seems to have fixed the problem. Will have it with me Saturday.
Your controller in general checked out OK. I replaced the alligator clips with brandy new stainless steel clips as the old ones were looking pretty sad. The real issue is that the battery is putting out 1.2v rather than 12v.
The controller seems to work just fine if it gets enough voltage, and both beepers (continuity and fire indications) are working. I will put the battery on one of may smart chargers and see what it will do, but the label says 1997 as the date it was originally tested. Not too surprising that a 23 year old battery pack may have gone belly up.
Thanks very much, Guy, for checking it out and putting in new clips. I thought that the battery checked out, but I’m guessing it was just for a heartbeat - enough for me to suspect a short with the intermittent behaviors.
I guess I’m now a candidate for technical support to ask me “are you sure that it’s plugged in?”
None of my smart chargers would even detect it as a battery. They indicate no connection. I have placed a 2 amp dumb car battery charger on it and it at least shows a charge of 2 amps, I will check on it later. It is possible that the dumb charger will charge it enough so that my smart charger with repair will at least recognize it as a battery. If it does, I will try repairing it. Not holding out much hope though. Probably time to invest in a new battery.