Check batteries to make sure they are fully charge (see TM 9-6140-200-14).
Access screw will be in various locations depending on the type of regulator found on your
carrier. See illustrations after 9 for picture of regulator found on your carrier.
Remove access screw (1) from regulator (2) or cover, if required.
Start engine and allow to run for about 20 minutes with service headlights on (see your -10).
Turn off service headlights.
Set multimeter to read voltage on the 50 Vdc scale.