Volt meter on the front panel to monitor your battery voltage.
The battery voltage is just 4.5V and the plug unterminated.
It cranked very slowly although the battery voltage was showing a full charge.
Also for 2009, the oil pressure and battery voltage gauges at the top of the center console have been eliminated.
This battery voltage was what would pass through the motorman's control stand and between cars.
Early radios required a power unit to convert the battery voltage to a value high enough for the valves.
However, the low charge light is operated by the battery voltage.
Additionally, the battery voltage declines as its stored power is drained.
With a standard electrical circuit, battery voltage is the cause.
Usually the 10-megOhm voltmeter is considered a better scientific measure of battery voltage.