disco_al Posted April 24, 2009 Share Posted April 24, 2009 last night i drove the ES in the dark for the first time, apart from one headlight bulb not working, as i was driving along the road, i could see the dash/headlights getting brighter and dimmer with the unulations in the road. any ideas? i'm still thinking of an earthing problem somewhere...... Quote Link to comment Share on other sites More sharing options...
Orange Posted April 24, 2009 Share Posted April 24, 2009 Alternator overcharging?? As the engine has to work harder/slows down to get up hills, the voltage decreases and increases again as you go down the hills... Bit difficult to measure in a disco while you are driving, but you could run a couple of long test leads to a point inside and attach a multimeter. It should show up on tick-over, though. Had a similar problem on an Astra and a new alternator cured it... It was trying to charge the battery at over 16v at its peak!!! Quote Link to comment Share on other sites More sharing options...
disco_al Posted April 24, 2009 Author Share Posted April 24, 2009 it's not engine speed dependant variations, it's as you are going over "normal" unudulations at cruising speed, such as potholes and the remains of roadworks Quote Link to comment Share on other sites More sharing options...
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