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Ever check for current running through it? There's no way to know unless you test it or touch the block near it. I have an ammeter wired to my block heater now as well as the timer.

I went through two and then added a timer for the third block heater . It will heat up for twenty minutes then turn off for five and then cycle again. The small space in the block doesn't contain enough water to prevent the heater from burning out.

test these Engine stop solenoid and timer relay

I would run it at 2300 and re-test it in a month. It will decrease over time on its own as the spring weakens.

I would go with a hot water heater , in order to get a decent 12 volt heater you'll need more amps than your alternator can put out and you'll kill your battery and probably the alternator over time. Been there, done that.

Just posting the finished project. The fittings on the valves were replaced with NPT fittings and the molded 5/8 hose came from O'Rileys , Gates 18777 coolant hose. Placed an air bleeder valve above the heater .

I bought one from Tractor Supply for my BX.

I'm glad I live on a CDN/U.S border.

5/8" Hose Barb Y Type 3 Way Brass Cut-Off Ball Valve 2 Switch with Clamps | eBay

I'm considering these valves.

Ok gang, thanks for your input, appreciate it.

Any reason this wouldn't work? Redirect hose from thermostat to the heater and run the return back to the water pump. I 'll add shut offs to bypass the heater in the summer and run the coolant from the thermostat directly back to the water pump.

You're welcome. I would have taken it out to size it but I don't have any idea what it does and didn't want to create a problem for myself.

I don't know the size but any dealer should be able to ID it from an ipl .

My 2370 has a bolt there, what do you need to know?

I might fabricate one. One piece of copper pipe, three valves, two T's and four barb fittings.

Good option, thank you!

Thanks for the ideas. Something like this little beauty would work.

What was the purpose for installing valves if the system had to have flow at all times?

The only issue is, I wouldn't be able to shut the heat off to the cab so the hoses would have to be disconnected in the Spring as you pointed out. I could install shut off valves in order to retain the fluid to the heater. Thanks for your input, much appreciated.