Vehicle & Technical > Discovery

Electrical problem diagnosis

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morfis:
Hi folks,

went out to the bus this morning and it seems electricaly dead - central locking not working, opened with key, no lights on dash.

Did the same a week ago - new battery was available so dropped that in and it started ok, went out to shops, came back - two hours later it wouldn't start. Disconnected battery and left it on charge for a couple of hours before going away for a few days (not in the car). Yesterday  I reconnected the battery and it started fine.

Any suggestions on how to diagnose the problem would be appreciated.

oops , forgot model -  98 disco 1

Evilgoat:
Pull out glowplug fuses, make sure that any heay consumers (Rear window heater, headlights etc) are off them put a meter in series with the battery, make sure its rated at least 20A and then pull fuses out till the drain goes away. Its possible its a leaky Diode in the alternator

morfis:
Thanks. What would a typical normal drain current be (glowplug fuse removed, standard TDi wiring)?

morfis:
Current drain with glowplug fuse removed, ignition off - 200mA  which doesn't seem excessive?

J.D.:
At a guess I would say the diode pack on the back of your alternator is knackered mate.

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