battery discharge

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defender/discovery

defender/discovery

Active Member
Posts
251
Location
sussex
we are geting major discharge in our 200 tdi defender 110 its discharging even just driving along no heater no wipers no lights but wen all turnt on its still work but with discharge in the red have had this trouble before but any ideas appreciated
 
just aint been under bonnet its tonning it down outside but check it all inside battery box and made sure my spots werent shorting on anything
 
Get an ammeter, put it into the circuit between the live battery terminal and the terminal clamp with the ignition off - the reading should be in the milliamps, say 20-30 top (if you only have a clock then this will be much reduced).

Now turn the ignition on with no other electrics (might be worth disconnecting the glow plugs unless you have a meter than can do about 50-60amps). You should have minimal current draw at this, all you should be running is a relay or two and the injection pump solenoid fuel guage, dash lights, under an amp, if you get a big draw then you have a short or something, but it would have to be really big to cause a major discharge.

Now this will prove there is no current going anywhere.

Then change your alternator.
 
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