When a cutout closes, the voltages are nearly the same on both sides of the contact points thus very little arcing . When you close them manually, you have no voltage on the generator side thus a heavy arc when they close and this damages the points even if they do not stick together like they some times do. Reverse current opens them with the bucking winding but if they stick it may not be able to do this. Not a recommended practice.
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Today's Featured Article - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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