What size are your ground cables/straps (1/0 (0) or 2/0 (00) are good)?

Make sure your ground strap/cables connection points are good:
- battery to frame
- frame to clutch housing (I connect this one to a starter mounting bolt).

Cover all shiney/cleaned connection points with copper-impregnated anti-seize "grease" (sold in most auto-parts-stores in tubes or small jars.