POST 1Original post
Chasing some electrical gremlins 06 boxster base . The alarm siren Horn next to main battery only showing .6 volts multimeter At plug. Plus saw horn has a rechargeable battery Any help Thanx
5 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
Discussion summary
YOUR RESEARCHAlarm siren
1 matching discussions were examined; no attributable action/outcome evidence was detected. No consensus or repair conclusion is claimed.
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1 matching discussions · 5 captured posts examined · 1 partial discussions
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5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
- Planet-9: 1 discussions
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POST 2Original post
This may be an aftermarket alarm, and could be a major cause of your electrical gremlins.
POST 3Original post
Pretty certain that's an aftermarket horn. Haven't heard anything OEM ever with an alarm siren that had a rechargeable battery attached to it -- probably something to continue even if the battery died. I'd strip it out.
POST 4Original post
Not sure if this was what you were asking about? Does it have VAG markings and a part number 951605B or similar as attached pic? Only noticed my hazards were flashing one night with no siren and mine one has just failed. A quick Google suggests there is an internal rechargeable battery in the alarm siren unit that fails between 8-12 yr point. It has an independent battery for the siren if someone tries to steal the car and cuts power from battery. Porsche wants around £260 plus another £57 for a harness adapter as part number has been supersceeded. Plenty of cheap Chinese ones or cheaper VW Skoda units on eBay. There are a few different types and I didn't see the point of buying a used one that might fail again very quickly because of age...
POST 5Original post
That unit comes back to the original manufacturer, Cobra Automotive Technologies, which was bought out by Vodafone in 2014. Much cheaper, and obviously much more advanced than that 12+ year old unit. Just based on the age of that alarm the battery must be of an obsolete variety, with newer ones probably having a much longer life. Like Jock McMad suggests there are many cheaper, and much better replacements out there. Good thing is you found the source for your electrical issues.
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