Circuit Verified

The fuel relay's hum led me along a heavy copper conduit straight into the open steel battery tray beneath the bus floor. Two massive lead-acid cells sat bolted into an iron cage, their heavy terminals crusted with a thin dusting of dried white sulfate. Resting across the chassis flange lay a discarded brass wire brush with a notched wooden handle. I took up the brush with both gloves, stepped onto the bracket, and dragged the stiff metal bristles hard across the corroded positive post. The dry crust shattered into gray powder, uncovering the polished lead beneath. Clean contacts ensure steady current. The power core stands ready.