How about a 12 VDC to 6 VDC converter. You'll want one that can handle the temps it will see in your part of the world. Here's an example but these are 50 bux. If you hunt around you may find something less expensive.
http://www.powerstream.com/dc-dcz0603.htm
Here's a cheapie:
http://www.eachbuyer.com/12v-to-6v-...USD&from=pla&gclid=CM6n3ee6xskCFYVrfgod-PMMEQ
How about a 12 VDC to 6 VDC converter. You'll want one that can handle the temps it will see in your part of the world. Here's an example but these are 50 bux. If you hunt around you may find something less expensive.
http://www.powerstream.com/dc-dcz0603.htm
Here's a cheapie:
http://www.eachbuyer.com/12v-to-6v-...USD&from=pla&gclid=CM6n3ee6xskCFYVrfgod-PMMEQ
Which also brings to mind a question I thot of when I started this quest ..... could I just use a 6V automotive voltage regulator ???
Yep, built for a different type of regulation...those were maily for current regulation....and to smooth out the fluctuations in voltage from differing rpm's of the generator...