Actually, that could just short out the battery, alternator, and other electricals, and would not juice it w/24 volts. 2 12 volt batteries in a series would give it 24 volts.
Sounds like a vacuum issue like stated. To shut down under the hood, all you have to do is press the "stop" lever. That is also where to check for lack of vacuum when the key is in the off position. You will need a mity vac as well, and you can test the shut off valve, and to see if vacuum is present when you shut down the engine.
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RRGrassi
70's Southern Pacific #5608 Fairmont A-4 MOW car
13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.
91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K
90 Dodge D250 5.9 Cummins/5 speed. 400K
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