1981 Sting Ray 3.0 140 MC I/O. Sold this boat to a friend last fall. Late in the season it developed an intermittent starter problem. It would click when the key was turned and would require jumping the terminals and would then start right up. I cleaned all terminals and thought I fixed the problem as it never failed to turn when I bumped the starter by turning the ignition switch. Now it's doing the same thing, new owner went through the trouble shooting process steps, but still has the problem. Can anyone help?