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1983 944 Alternator Not Charging

Electrical

Vehicle Information: Model(924/944): 944; Year: 1983; Engine (type, size, modifications): 2.5 liter; Total Mileage: 104,00;

I recently had the alternator rebuilt and it is now not charging properly. The battery is new. When I hooked everything back up and checked the connections, I checked voltage at the alternator to be 14.3 vdc and at the battery 13.9 vdc. After a while of driving, I notice that the radio goes out and other electrical devices go out. I recheck voltage at alt 10.2 vdc at battery 12.5 vdc. When i turn on lights alt voltage drops to 9.85 vdc and drops at battery 12.5 and drops. Is the alternator no good or is there a short in the system? I have checked wires at the alternator, battery, and starter they all look good. Should I be looking for faulty grounds?

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