Quote:
Originally Posted by jnc19610
This is simple.... a dim light means a diode is bad.
I'm an ex-battery company guy, but... I don't know the specifics of MB alternators, but generally speaking, there are 3 positive diodes, and 3 negative diodes. If one is bad, the the alternator light will 'glow'. What it means is you are 'down' about 1/3rd your alternator power. You can drive it this way, and if you're carefull, it can even last a long way. Personally, I'd recommend removing the alternator, and having it 'tested' by a good alternator shop. They should find the bad diode, and charge you for just that. $30, and you should be back on the road. (now... can you find a good alternator shop)
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This sounds almost exactly like the problem I'm battling. Especially the part about driving it for a long way before it dies. I bought a new battery two weeks ago and it worked fine for a couple of weeks and then died. I've already replaced the belt and the voltage regulator which cured the glowing battery light problem I was having, just like Jim (coadman) but obviously not the undercharging.
I'm about to spring for a new alternator. JNC. Are you saying that I would only have to replace a diode in the alternator? How does one go about doing that?
- Peter.
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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S