I have a rover 420 turbo diesel, when i leave it over night the next
morning it seems like the battery is flat, replaced battery twice when
it has started it is fine for the day, also when the ignition is
switched on there is a sort of buzzing sound from the alternator.
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Diesel or petrol? Either way, does the starter crank? If so, you probably have a fuel delivery problem. If not, check the battery also the starter solenoid - give the latter a good bash wit h a hammer to loosen any rust - quite common.
Put a meter across the battery terminals - if less than 12.5 volts or so, get an auto electrical to do a load test on the battery before replacing it
With the diesel engines you have to let the ignition coil warm up before you will have any luck cranking it. Diesel cars are no good in subzero temperatures. I had the same problem with my 92 300D Turbo and when i took it to MB they told me it was because i wasnt letting the coils heat up long enough.
NO the alarm does not draw that much current for it to drain the battery. Look for a light bulb like the one under the hood or the glove box. The other thing to is if you have a rear wiper for the window, it's been know for the wiper arm not to return full back to it's neutral position due to corrosion at the shaft and the motor will draw current trying to pull the wiper arm back to the neutral position. Try pulling the fuse to the rear wiper motor from the fuse box and see if the battery stops draining. Good luck and hope this helps friend.
looks like you have something draining the battery (something electrical staying on) disconnect your battery negative terminal and connect a test light between the battery post and the wire clamp if the light comes on you have battery drain (make sure interior light is out when testing) you now need to go through all elctrical systems to trace the reason why ( check boot light goes out first this was a favorite cause)
obviously there is an abnormal drain on the vehicles electrical system. Examples of this are a glove box or conso;e light staying even though you closed it, is there a reading or compartment light on ? Anybody that just says "you need a battery without ALSO testing the electrical system for integrity is not helping,
it sounds like your fuel lines aren't maintaining pressure and the angle is allowing too much fuel to drain out of the lines. i have the same issue with and older f350 diesel if i let it sit a while and it doesn't get started.