Peugeot 307 electrical problem

Car: Peugeot 307
Variant: 1.6 16V Petrol
Model Year: 2006
Categories: Running Rough, Starting & Power Loss
After driving my 307 for a short time (5 mins) then come to a stop, the engine revs decrease and bounce back up again constantly but this happens more when the lights and heater are on at night. I have just changed the sparks plugs and filters (still need to change the oil and filter) But wondering if this would be a problem with the battery or alternator? No warning lights have come on the dash!

Thanks
Posted: Nov 9, 2015 (9 years ago)
I suppose the first thing I'd check is as you suggest the battery charge and alternator charging.
Could be over charging.
Which doesn't always throw a code or warning lamp.
Had a Renault in just past,
all kind of weird symptoms,
But his battery load tested as dead,
and the alternator was outputting over 15V.
Way too much,
new battery cured it.
Posted Nov 9, 2015 (9 years ago)

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