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Old 01-03-2017, 05:43 PM
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1975 Mercedes 450sl alternator or voltage regulator?

Car won't start.Installed new battery. Red Battery light shines and all electrical works, but the car won't start. Turn ignition, 1 second humming sound then nothing. Do you think it's the alternator or, hopefully, the voltage regulator?

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Old 01-03-2017, 05:58 PM
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Or neutral start switch?

Sixto
83 300SD
98 E320 wagon
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Old 01-03-2017, 06:18 PM
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Quote:
Originally Posted by rlbook View Post
Car won't start.Installed new battery. Red Battery light shines and all electrical works, but the car won't start. Turn ignition, 1 second humming sound then nothing. Do you think it's the alternator or, hopefully, the voltage regulator?
In most cases the generator/alternator and its regulator do not crank the engine; the starter motor does.

As sixto suggests, the neutral safety switch can fail to close the starter energizing circuit. Another problem can be starting two threads, a day apart, on the same subject. One subject>one thread!

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