I've just replaced the clutch in a 2006 xsara Picasso 1.6 petrol and its developed a charging fault. The battery quickly discharges while the engine is running. I can charge the battery and it will stay charged all week as long as I don't run the engine.
I've checked all the earth cables that I removed and cleaned them just in case. There are no wires trapped that I can see. The battery warning light goes out as soon as the engine starts, but the voltage measured at the battery, or even at the alternator main terminal is below w 12volts.
I have substituted the alternator with h a known good unit and the problem persists.
Any ideas please anyone?