How to read an amp gauge
Ammeter measures current flowing in or out of the battery.
Current flowing to the starter solenoid and starter does not go through the meter.
The meter on a '68 shows 40 amps to 40 amps.
A slight discharge at start is expected. This would be 2-5 amps flowing to the starter relay and ignition coil.
At fast idle, immediately after start the ammeter might show as much as 20 - 30 amps charging. It would only show that much if the battery is a little lower than normal.
In less than a minute, the current should drop toward zero as the battery charges. Quickly at first and then more slowly.
At slow idle with a stock alternator you may see the battery discharge slightly when lights and accessories are on. Accessories being things like wipers, and heater fan. It will then charge as soon as the rpms come up while driving.
If a charge continues for a long time, it could be an indication of high voltage causing overcharging. While the meter is showing that charging check the voltage. If its the normal range, everything is fine and the battery just needed a long slow charge.
Ammeter measures current flowing in or out of the battery.
Current flowing to the starter solenoid and starter does not go through the meter.
The meter on a '68 shows 40 amps to 40 amps.
A slight discharge at start is expected. This would be 2-5 amps flowing to the starter relay and ignition coil.
At fast idle, immediately after start the ammeter might show as much as 20 - 30 amps charging. It would only show that much if the battery is a little lower than normal.
In less than a minute, the current should drop toward zero as the battery charges. Quickly at first and then more slowly.
At slow idle with a stock alternator you may see the battery discharge slightly when lights and accessories are on. Accessories being things like wipers, and heater fan. It will then charge as soon as the rpms come up while driving.
If a charge continues for a long time, it could be an indication of high voltage causing overcharging. While the meter is showing that charging check the voltage. If its the normal range, everything is fine and the battery just needed a long slow charge.
