Battery voltage issues.

[tim]

How old is the battery? Go buy a hydrometer from the parts store for 1.99 and check each cell in the battery. Look for variance among cells.

Could really be the alt, battery or a poor connection. I would definitely check all connections at the battery and alt for corrosion and make sure they are tight.

The heat during the summer is hell on a battery and if it is older it could just be time for a new batt. You need to do a little more testing to narrow it down.

When running you should be reading atleast 14volts and when shut off a full batt will be 12.6 volts but can be higher since is was just being charged by the alt.