Originally Posted by C.C.
Should this indicator work if unplugged from a power supply.?
No, it takes a minimum of 6 volts to turn on the "L" light. With a high resistance "open" between the battery and the power center you would get zero volts (or extremely low volts) from the 12 volt battery.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW