440 Flat battery

Mark,

Have you or anyone else worked on ANY of the electrics prior to this happening? Was this problem the reason you got a new battery? Has a new radio or alarm just been installed? Post ignition electrical drains are easy to track down by attaching an ammeter with the ignition off, and selectively disconnecting stuff (by removing fuses), until the ammeter reading drops, it's also possible for faulty rectifiers in the alternator, or faulty central locking controls to cause this problem, automatic electric aerials, and small lamps such as boot/bonnet lamps can cause this as well, as can a faulty battery. Some bad news; if your new battery has discharged so many times, then you need another, because the plates will have sulphated up already, reducing it's capacity, find the problem, then replace the battery.

Good luck, Ken 740 gl, moded to gle owner

Easy: put a current meter in series with the fuses and see if a current runs when the car is switched off. Measure all. Once you found the one, disconnect all devices until the currewnt stops.

It id also possible that your battery is not charged correctly. Measure the battery voltage when the motor is on, it should be about

Regards,

Pieter Hoeben

Don't know where you are or where you got it from - but I'd be tempted to take it back:-)) Seriously tho - it could be something simple like you internal courtesy light is on when the doors are shut, or more complex like the others are suggesting. Check that all lights are off inc glove box, boot etc. Threaten it with the scrap yard - that works with my 440.

One of two things:

Either you have a light stuck on- i.e. glove box, ashtray, or boot light. OR you have a failed diode in the alternator which is causing the discharge.

A tip with the alternator is with the engine stone cold, place your hand on it- if it feels above ambient temp then its definately at fault.

Tim..