Headlight / Instrument Light brightness issue

[debaron]

Got an odd one on my car at the mo... The headlights vary in brightness regularly. The instrument lights do the same thing at the same time.
I think this is an earth issue but I would have thought the instruments use the transmission tunnel earth and the headlights use the rad earth therefore ruling out a common earth problem?


Anyone any ideas what could be going on here?


Thanks



Ryan

[Mark_S_24]

I had a similar sounding problem.
But I also had intermittent Alternator issues... sometimes it just didn't work.
Got the Alternator replaced (it was less than a year old) and both faults were resolved.
Oh, I also changed the battery at the same time as it was a bit goosed after 3 or 4 discharges from the Alternator deciding not to work.
I "think" it would be down to the diode pack not regulating the output properly, but I'm sure some sexpert will be along to give you the truth :-)

Mark

[Andy chimaera]

i had an altinator issue too, but all it was, was the fusable link to the altinatior corroded, about a 10 quid switch i think, while i was there they moved the fusebox to a safer position and sprayed all my connections to protect them more, the point is, it was a gradual problem got worse over the months, started with a misfire when the engine got warm believe it or not and i guess as the corrosion got worse, the electrics started playing up