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The coolant heater draws 3.5 amps when running, so figure several hours at least with stock 6TN/TL batteries. Ideally, use a "marine" battery set-up where the starting batteries are isolated from the "house" batteries, which can be of the deep cycle type.

In general, the heater is mounted below the coolant system and its output goes to the top of the engine while it's being fed coolant from the lowest point of the water jacket. For the m809 series, see image below. Note: If you include the battery box as shown, watch your temperatures as they...

This is how the coolant heater flow is specified for the fuel burning heater. The lowest part of the engine coolant jacket is the input to the heater and the heater output is connected to the water pump. Flow is the reverse of the normal flow and the loop should be shut off when the engine is...

Nice install. Your engine, starter motor and batteries with love you for it. :-)