Sounds like loose or dirty battery cables.
Use sandpaper and/or a wire brush to clean the battery posts and terminals.
You may also have a bad battery, even though it is new. If the terminals are clean and tight, it sounds like the battery has a bad cell.
Put a digital Voltmeter on the battery posts, you should have 12.6-12.7 Volts with a fully charged battery, turn the headlights on and see what the Voltage reads, it should not drop below about 12.3-12.4 Volts within the first minute.
JamesO
Use sandpaper and/or a wire brush to clean the battery posts and terminals.
You may also have a bad battery, even though it is new. If the terminals are clean and tight, it sounds like the battery has a bad cell.
Put a digital Voltmeter on the battery posts, you should have 12.6-12.7 Volts with a fully charged battery, turn the headlights on and see what the Voltage reads, it should not drop below about 12.3-12.4 Volts within the first minute.
JamesO
