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It seems like it may be the tach itself.

Stock except for Pertronix in place of the points/condenser.

Yes the blue wire is connected to positive and the other to the coil. I’ll try grounding the case to a metal ground and see.

The PO installed a new aftermarket clock/tach in my 1969 Superbee. I verified the connections to be correct but it still does not function. On the back are some nuts marked with a ‘G’ by each one. Is this for a ground? Do I need to run a wire from one of these posts to a ground connection? Thanks.

Thanks. I made a connector from the unused field tab to a bolt on the case. It is now charging fine.

Thanks. I have a new round back type made by PowerMaster. Will check the back to see.

Yes I am.

Great thanks.

From what I have read, the second field connection on a dual field alternator must be grounded in order to charge the battery correctly. Where would be the best place to run the ground wire? Can I just connect to the case of the alternator?

Thanks. I’ll check the output at the alternator and make sure the ground is good at the regulator. Mine is mechanical too. I took my battery in to the auto parts store and they tested it. Showed the battery was perfect so at least know it’s not that. Some alternators I have seen have a ground...

I touched that part with a screwdriver when the engine was off and I did feel a slight magnetic pull.

Can’t say for sure. The car has various other issues and all I can do at this time is start and idle it in the garage for now. I just so happened to decide to see if it was charging or not.

Turns out my alternator only has the one single field connector.

Thanks. I’ll check out the grounding.

Maybe running a ground wire from the alternator case to a good ground connection may solve the problem?

Yes the battery is not charging since I measured the voltage with a multimeter and with the car running only 12.8 volts. Could a brand new alternator be defective?

At the battery terminals I get a voltage reading of 13.3 when fully charged. When the car is running I get a reading of 12.8 volts. I turned off the car and got a reading of 12.8 volts at the field wire with the key turned on. I have a new alternator, new engine compartment wiring, new voltage...

Thanks for the update. I will still keep waiting for a little bit longer in hopes I finally receive the battery.

Looks real nice. I’m sold.

Thanks for the link. I will go that route and order that kit. Does the stock battery hold down hardware still fit this ok?