The Ford Barn - View Single Post - Wesenberg EVR- voltage cycling problem

rotorwrench · 08-20-2023, 10:12 AM

Tom and others utilized electronics that will pulse the output to limit the voltage. Tom may have also had a current limiting circuit on his but I don't know how he set it up. John Regan didn't. He used the 3rd brush to limit the current.
The pulsing should have been fast enough that the ammeter wouldn't even register it. Most of these units will show a charge on the ammeter after start due to the amount of current that was drawn out of the battery. It takes it a bit to restore that energy level to the battery but it shouldn't indicate much charge after the battery is restored to full capacity. The OP's EVR seems to have had some intermittent problem for it to give the ammeter indications that it did. I can't say if it was strictly related to the EVR or was some other cause in the generator or the cars wiring to the battery.

Using the old electro-mechanical three pole generator control unit will not work with a 3-brush unit. It would have to be converted to a two brush unit for it to properly function. It would not be all that easy to do that since the brushes would have to be relocated to match the later type generators used by Ford up through 1955.

08-20-2023, 10:12 AM	#9
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,515	Re: Wesenberg EVR- voltage cycling problem Tom and others utilized electronics that will pulse the output to limit the voltage. Tom may have also had a current limiting circuit on his but I don't know how he set it up. John Regan didn't. He used the 3rd brush to limit the current. The pulsing should have been fast enough that the ammeter wouldn't even register it. Most of these units will show a charge on the ammeter after start due to the amount of current that was drawn out of the battery. It takes it a bit to restore that energy level to the battery but it shouldn't indicate much charge after the battery is restored to full capacity. The OP's EVR seems to have had some intermittent problem for it to give the ammeter indications that it did. I can't say if it was strictly related to the EVR or was some other cause in the generator or the cars wiring to the battery. Using the old electro-mechanical three pole generator control unit will not work with a 3-brush unit. It would have to be converted to a two brush unit for it to properly function. It would not be all that easy to do that since the brushes would have to be relocated to match the later type generators used by Ford up through 1955.