I use to have a JB3 and ran this to power it:
10 amp SLA>alligator clips female cigarette lighter thing (radio shack)>Universal Car power kit (with selectable voltage or the creative one)>NJB3.
My question is what letter from radio shack coresponds to the right power jack. (At radio shack they assign a letter to correspond to the universal input jacks)
Also using the above system which do I turn the voltage dial to? 3v, 4.5v, 6v, 9v, 12v...
The information is probably out there already I just didn't find it