To all who replied:
This has been a real learning experience for me. Never heard of a Zener before!
There are many "off the shelf" gismos that will do the job and can get
expensive.
I like to tinker and experiment so I am going with

1. resistor of; 1.99 ohms, 32.16 watts.
2. Zener of 6v.24.12 watts.

I got these numbers at the Zener diode selector

My meter would not register the spike for the rewind stage, so I hooked the
Hobbs up to the battery charger switched to 6v in and 6amp. When the spike
came, the meter jumped about 1.5 amps. I used 2000 mA for the diode selector.

And to Kevin Gallimore...probably be a year. (90% done and 90% to go) But if
you want a ride in the Marquart Charger, come on down and we will bore some
holes in the sky!

Regards and Thanks to All.
Warren