Does anybody know how much amperage draw should show on the negative battery cable while engine is running , with know accessories on. I am showing 1.5- 1.7 amps. I have been told it should it should be Zero.<br /><br />If I bring my battery voltage down to the low 12 volts before starting, I charge at about 14.5 volts until the battery get up to around 13 plus volts then it starts showing a charge of about 16 volts. Doesn't that sound backwards. Just like the more accessories I have on the lower the charge.