You probably have extremely corroded battery cable clamps. Get a battery terminal brush and get them shiny clean. One of those should be in every toolbox and used every time the cables are disconnected.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.