Hi guys and girls,

Recently replaced my alternator on my 90 300D with a rebuild. Everything is working fine, except I notice that my lights (headlights, dashboard, interior lights) pulse or flicker. Happens more when I give the car gas. They go bright and then dim. Everything seems to be working fine otherwise. Can this be a bad rebuilt alternator? I bought it from a local auto parts warehouse. All help is greatly appreciated. Thanks

Sounds like loose wires or a bad ground.

Did you install a new regulator or reuse the old one?

Sixto
87 300D

I have a bad one in my TOYO thats loud.I will pull it when warm and get another one.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

If by local parts house you mean a place like autozone....then its likely a very low quality unit.....only the german rebuilds last a long time.

I will never order another alternator/starter/pump/anything like that from an autozone type place ever again. They sell junk.

Sounds like a flaky voltage regulator at the least....

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Wouldn't be the first Cheap-o Depot alternator to be DOA.

I've experienced this in the past and never tracked down the root cause. I had a Peugeot that did what you describe. It went for years and many miles that way. I'd suspect the voltage regulator, but I'm not sure.

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1987 W201 190D