Thread: Chevrolet Alt Charge rate

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The Powermaster is a great alternator. It’s straight-forward in its operation and seems to be a very solid unit. I have installed several of them over the years and never had issues with overcharging. My insides tell me that you have a grounding problem. Make sure you have a ground strap from the case of the alternator (Powermaster has a 5/16” – 18 tapped hole for this) to chassis of your car (see below).Also make sure your negative battery cable is well connected to bare metal on the engine block. I use star washers between the cable and the frame/block as they dig into the surface as they compress and help assure a good bond.

I also run a #6 wire (with crimped and soldered copper connectors) directly from the alternator to the battery – using a battery terminal connector with a lug designed to accept a connection.

Measure at the battery using a good digital meter – should be 12.6 – 13.4 volts

Regards,
Glenn