Lights pulsating

Feb 20, 2006 6 Replies

I have a 1990 RR Classic. I replaced the alternator recently and eveything has been fine. The other night after starting the vehicle I noticed that the headlights were pulsating as were the ABS/engine light on the dash panel. There is no hesitation in the engine and the alternator belt is tight. I had the alternator tested and it is working fine. This was not immediate after the replacement of the Alt., so I believe there is another cause but I am unable to determine what it is. I'd like some suggestions before I take it to a shop. Any help would be appreciated.



Were there any lights in the sky at the time? Has your bottom been a little sore recently?

Lock your doors.

I think you have to have parked on a level crossing with the signs all shot up to qualify for the above. Or be looking for an excuse for taking 4 hours to "give the barmaid a lift home".......

Richard

Is this on tick over or when driving?

I've only seen it when the alternator had nearly worn out brushes. It was still producing enough volts/amps to be passed 'working' though. If it was a new alternator it might be a stuck brush.

John

Did you replace it with a *new* one and did it come with pulley. If not you might not have tightened it enough, the modern tin pulleys don't have a keyway in them. Otherwise regulator in alternator may be faulty, take it back to test.

HTH Martin

Thanks for the many suggestions. I realize that I know even less than I thought I did after reading them. My automotive skills haven't progressed much beyond repairing my Series III.

Thanks again.

Oily wrote:

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