Electronics > Beginners
Determine old resistor from old vehicle
viperidae:
Tapping 12v from a 24v system sounds like a terrible idea to me. You'll end up killing the the other battery, as it gasses out its electrolyte when fully charged, while the other battery is still charging due to bring discharged more.
AVGresponding:
Not really, glow plugs aren't running constantly; they are heated electrically when the engine is cold starting, then they are simply a thermal mass once the engine is running.
https://en.wikipedia.org/wiki/Glowplug
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