Volvo overdrive question

[Mike/Nebraska]

I have a Volvo electric unit in my Model A that I can't get to engage. It's a 12v.unit and I'm still using 6v. I was told by others that they have them and they run them on 6v. I have it grounded to the frame and to the tranny. I touched a 12v battery charger to the solenoid and it clicked so do you think using a 12v inverter to the overdrive would make it work? It would be easy to mount the inverter under the seat