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Alarm battery

Stewart Rix

Stewart Rix

PCGB Member
Member
Here's one to ponder. After a week of not using my turbo, I found the battery dead. OK so not so unusual in itself; the remote fob would not open the door, so I used the key to get in, popped the hood and hooked up my Ctek. Almost immediately the alarm started making a pathetic chirping noise which I managed to stop using the fob after 10 seconds or so.

OK, so the question. Could the alarm sounder internal backup battery have died (hence the alarm not sounding until I provided some power to the main battery)? If it is dead and hence not holding charge could this actually contribute to making the main battery go flat (as it continues to try to 'top up' the alarm sounder battery)?

Incidentally, how would I tell if the earth strap has failed (suggestion from another 'flat battery'post)?

Cheers
Stewart
 

More to the point Stewart, could your insurers refuse to pay out because the car does not have a working Cat 1 alarm fitted? [8|]

It seems quite plausible that if the system is continually topping up the dead alarm battery that this would be a major factor in the main battery discharging quicker.

I would disconnect the earth lead from the battery and use a multi-meter to check its reistance.

 
A week seems pretty fast to zap the main battery just because it's topping up the alarm battery. I did see this symptom a while ago when I left car for about 3 months with no charge on it. The battery had gone so low the alarm had thought it had been disconnected, so sounded (annoying the neighbours) until it was dead too. Then it sounded as soon as I connected the charger.

Did your alarm go off during this week?

How long is the alarm battery supposed to last and where is it? I don't remember anyone mentioning needing to replace it but it can't last for ever???
 

ORIGINAL: jdpef356

I would disconnect the earth lead from the battery and use a multi-meter to check its reistance.
Click to expand...

Make sure you have your radio code first[;)]
Click to expand...

Good point. I keep forgetting that bit as I still have the original Blaupunkt Bremen with a key card

 
My presumption was that no battery lasts forever and hence would expect degredation over time - the alarm battery will have probably been in the car for 15 years. I noticed the existing main battery is a 60mah so have just bought a new Bosch silver s5. That might help, but I still need to trace the source of the high current drain.
 
For the sake of a few pounds, i would just change the earth strap , as it is 15 years old. mine caused me no end of problems till I changed it, regards
 
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