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That should work fine with one bat. Manual switch on the glow plugs is a good idea. I think I'll do that too. On my truck, the computer turns the heater grid on when iat is low enough, even after the engine is running. The headlights dim and the idle drops about 50 rpm. I don't feel it's needed after initial startup in the morning. If the engine is fresh and compression is good, it shouldn't need the extra heat. Still keeping the second bat though. Live and work in the mountains, sometimes way out in the wilderness. Just put a fresh set in about 2 weeks ago on one of the trucks.
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