This past weekend the power tilt/trim stopped working on my 1988 Evinrude 88hp. It stopped working, then began working again and finally stopped working for good. I can hear a single click when I try to move it up or down, but the motor won't run. I checked the battery and it is fine. I think it may be in the wiring, as I have had this problem occasionally in the past and it has repeatedly fixed itself in a matter of seconds/minutes. Any ideas as to what is wrong and how I can fix it? Thanks for your help.