Switched Ground On Tank Heaters

[Farnham1162]

I'm installing a switch on the heating pad for my LiPo battery in my 2025 44v14. The switch is a RecPro lighted "on/off" switch, similar to those found for the other tank heaters. In conversations with Alliance, the existing tank heater switches are wired on the ground side of the circuit; the result is that they only light up when the tank heater thermostat is closed (i.e. calling for heat) and the switch is on.

I'd like to emulate this behavior with my battery heater switch; however with it being switched on the ground side I'm getting stuck on the appropriate wiring scheme to get the LED to light up when the thermostat is calling for heat. So far, I've wired the heating pad ground to the "battery" terminal of the switch, and the other two terminals to ground. I've verified the switch is functioning correctly; however the LED doesn't light up. I've also verified the switch works in a "normal" condition just testing it off of the battery. I suspect the issue is because the switched ground is at the same potential as the internal switch LED circuit, thus it doesn't light up. I'm thinking maybe a resistor somewhere in the circuit is what's required? Thoughts?

 

[BryanValRox]

I'm installing a switch on the heating pad for my LiPo battery in my 2025 44v14. The switch is a RecPro lighted "on/off" switch, similar to those found for the other tank heaters. In conversations with Alliance, the existing tank heater switches are wired on the ground side of the circuit; the result is that they only light up when the tank heater thermostat is closed (i.e. calling for heat) and the switch is on.

I'd like to emulate this behavior with my battery heater switch; however with it being switched on the ground side I'm getting stuck on the appropriate wiring scheme to get the LED to light up when the thermostat is calling for heat. So far, I've wired the heating pad ground to the "battery" terminal of the switch, and the other two terminals to ground. I've verified the switch is functioning correctly; however the LED doesn't light up. I've also verified the switch works in a "normal" condition just testing it off of the battery. I suspect the issue is because the switched ground is at the same potential as the internal switch LED circuit, thus it doesn't light up. I'm thinking maybe a resistor somewhere in the circuit is what's required? Thoughts?

Hello folks,
I am thinking it might be helpful if you were able to share any information that you might have received with your switch and heating blanket. (instructions, wiring drawing, line art etc).

 

[M and E]

I'm installing a switch on the heating pad for my LiPo battery in my 2025 44v14. The switch is a RecPro lighted "on/off" switch, similar to those found for the other tank heaters. In conversations with Alliance, the existing tank heater switches are wired on the ground side of the circuit; the result is that they only light up when the tank heater thermostat is closed (i.e. calling for heat) and the switch is on.

I'd like to emulate this behavior with my battery heater switch; however with it being switched on the ground side I'm getting stuck on the appropriate wiring scheme to get the LED to light up when the thermostat is calling for heat. So far, I've wired the heating pad ground to the "battery" terminal of the switch, and the other two terminals to ground. I've verified the switch is functioning correctly; however the LED doesn't light up. I've also verified the switch works in a "normal" condition just testing it off of the battery. I suspect the issue is because the switched ground is at the same potential as the internal switch LED circuit, thus it doesn't light up. I'm thinking maybe a resistor somewhere in the circuit is what's required? Thoughts?

So when the thermostat is closed, and the switch is "on" is the only time you want the led to illuminate, correct? I don't think a resistor will achieve that end, but a 12V relay in parallel with the pad's thermostat might. But, it also depends on the switch.