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Question:

Rover 420 draining battery overnight 4A draining. Removing Fuses dont stop it. New battery, alternator working

I have a Rover 420 GSI with an electrical problem. Battery drains over about 40 hours. Replaced it with a new battery. The alternator has also been tested. There is a 4A current being drawn all the time from the battery, when the car is turned off (overnight). I have tried removing all the fueses I can find but nothing makes it drop. I am no great electrical expert. owever, Ive tried removing the Alternator and fan out of line. As it wears down the battery the battery light starts indicating on the dashboard. I am guessing there is a relay or something held open. Is there some easy way of testing them? Thanks.

Answer:

Normally I would suspect a boot or interior light being left on but if you have removed all the fuses then this is unlikely. How do you know it is 4A drain? Have you measured it with ammeter? 4A is quite a drain and looks like an unfused route. This suggests any off: A slight short to earth via a poor 'connection' between battery and fusebox. Alternator. Starter solenoid. This is a possibility. Is it an automatic? If so then park it id D or R and see if the drain stops. This would indicate draining via the start solenoid.
If okorder
A 4 amp draw is enough to produce heat in a component.It can be located by scanning the engine compartment and interior with a remote temperature sensing thermometer.They are available from Harbor Freight for around $40 and can be very useful around the house for other things.
What is still working when the fuses are removed .I t is obviously something that has an ignition fed supply that is not switching off with the key. Is the boot light still working ,Check the earth connections Are the reversing lights working ,check the reversing light switch---remove the relays while checking the current drain
the surge whilst shifting into rigidity sounds like a very self sufficient difficulty. many times it incredibly is led to by capacity of low computerized Transmission Fluid. If it hasn't been run in a collectively as, it takes a 2d for it to warmth up so it fills the torque converter thoroughly. before it lurches, it probably sounds like it incredibly is desiring to have extreme RPMs to flow a low velocity. If it makes an extremely loud slamming noise, it incredibly is possible some thing interior the transmission itself is a difficulty, yet in many circumstances it sounds extra like grinding, as though the gears did not somewhat catch. If the motor vehicle starts off, runs and has 14.x volts on the battery, then your floor isn't a difficulty. make helpful in spite of the incontrovertible fact which you have the extremely floor strap grounded to the motor vehicle. at times the helpful cable to the starter is wrapped in black that may bring about issues and a presently lifeless battery in case you floor it to the chassis. yet it incredibly is probably not the difficulty for you. Like different persons have stated, short circuits would reason a speedy battery drain. while you're leaving it for a week and the battery is dying, i does not hassle too lots. the motor vehicle i'm engaged on perfect now, (1986 BMW 325e with 1991 525i engine) loses adequate power over the process a week if it incredibly is not run so as that even the electrical powered locks do not paintings, much less initiate. My chum's 1989 325is seems to run dry quickly too. element is, some automobiles in simple terms are enormous battery wasters and in case you do not rigidity it many times, it's going to lose its charge notably without postpone. wish i've got been effectual, and strong luck fixing your difficulty!

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