When I got the bike it had a new battery. It is a used bike. worked good for first week or so then I had to jump it off. Guy that I got it from thought it was a ground issue. I checked voltage at the battery, it tested 1.5 volts. Not sure if its a 6v battery but sure its dead. Jump started the bike. Checked for voltage at battery terminal and it produced 8 volts. I also wired temp. ground to frame, made no difference. I don't know what voltage the regulator should send to battery and is it voltage or amperage i should be checking for. I dont own a dc amp probe. Bike can run for hours and turn the key off no lights, bike wont restart....nothing. Jump start it and fires drop of a hat. Is the regulator dead, or is it the battery. Any suggestions would be greatly appreciated. Thanks  

There is probably writing on the battery that says what the voltage is.  Also, you could count the number of cells.  A 12 volt battery has six cells (spearate compartments that hold fluid), a 6 volt battery has three.  I'm betting it is 12 volts since that is pretty much standard.

A regulator will put out 14.0 to 14.5 volts to charge a 12 volt battery.  But to get these voltages the engine has to be turning at more than idle, plus the battery can't be completely dead. In the case of a completely dead battery even a working regulator and/or stator will be kept in current limit for a while until the battery gets at least 10% charged.

A battery or regulator is not required for the engine to run.  The ignition power comes off its own winding on the stator.  Another stator winding is used to feed the regulator and keep the battery charged (and sometimes run the automatic choke).  The battery is only used for starting.

If it is a 12 volt battery you could always jump it to your car and charge it up for a half hour (car engine must be running at idle to charge).  Then see if it holds a charge overnight sitting disconnected all by itself.  One thing is for sure - if you leave your battery discharged it will sulphate up and be ruined within weeks.  The longer you leave it this way the more damage is done.

eBay is a great place to find cheap replacement parts (but not batteries - they are hard to ship).  Wallmart is cheapest place for replacemant batteries (about $27).