Date registered: Apr 2005
Vehicle: 1974 450 SL
Location: Coos Bay Oregon
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High Charging Voltage Seems to have killed my Battery
My battery (not sure of the vintage) stopped holding a charge the other day. After charging it up and then testing it, I found it was really toast. 2 seconds after hitting the key switch, voltage would go to almost zero and the engine would barely turn. Yep, a real dead battery.
So I bought a new battery and hooked it up. On start, the voltage climbs to the high 14s as expected. But when the RPMs increase, so does the battery voltage. It goes up to almost 16v. Now this is a brand new battery and has a full charge already so it should not be taking such a high charge for so long after starting.
So my charging system is not working properly. The alternator is definitley putting out juice because the voltage raises after start. But the regulation system is not holding the voltage back to proper levels and seems to be the culprit.
Can someone guide me here? Is the voltage regulator the only culprit based on this condition? Or is there anything else to check out before I start spending money?