Control Panel indicators
My 27' 1971 Overlander AS has a control panel but some of the indicators do not work.
The Battery indicator works and the panel illuminator lights work.
This indicates that there is 12 volts to the panel.
My problem is that none of the level indicator bulbs will light:
Holding tank, Water level, etc..
I am not certain if it is the bulbs, if so where can I get replacement bulbs?
It may be the sensors, can any one give advice on testing for indicator functionality?
Any advice is greatly appreciated.