Leaderboard

Upto 13.9Vdc is what I would usually consider fine, but this is all part of servicing to make sure the voltage regulator is still ok. It's down to design, you need the headroom from the regulator to charge the battery correctly. Transformer output will be around 19Vac for example. PIR's are all different but usual working voltages will be 11-15 ish. As long as there isn't a random device, junction box or other joint somewhere, paint by colours should work fine.