Engine Block Heater Minder Circuit

If you live in the frozen north, knowing your engine-block heater is working is a comfort. This device will let you know if yours is okay. Plug in PL1 to your power outlet. NE1 should light. Then, plug in the block heater. Depressing SI should cause the indicator to get brighter.

If not, your block heater might be open and inoperative.

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