Tank (Black Grey) Heaters
Our new-to-us 2008 Coachmen Class C came with Tank Heaters - according to the PDF brochure. If the motorhome is unplugged from shore power (on battey) and if I flip the coach switch marked Heater, ...
Forum Discussion
Sounds like yours are 12V DC (light came on when not connected to AC Power)
They are typically controlled by a t-stat on the heat pad.
Sensor detects temp below 44*F heat pads are activated......then deactivated when temp above 64*F
Indicator light is so you have a visual that they have 'power'.
On/Off switch should be OFF when ambient temps are above freeing and/or if tanks are empty. W/O liquids in tanks......pads can damage tank
You could dump bags of ice down toilet to chill black tank or buckets of ice water down sink drain and test pad amp draw
They are typically controlled by a t-stat on the heat pad.
Sensor detects temp below 44*F heat pads are activated......then deactivated when temp above 64*F
Indicator light is so you have a visual that they have 'power'.
On/Off switch should be OFF when ambient temps are above freeing and/or if tanks are empty. W/O liquids in tanks......pads can damage tank
You could dump bags of ice down toilet to chill black tank or buckets of ice water down sink drain and test pad amp draw
