Starboard starter is not engaging at times and now the port starter is beginning to click, click, click when I turn the key. I hit my batt parallel switch and it provides enough power to turn over. My first thought was batteries since the ones in there now are 3 years old and don't seem to hold a charge. So, I replaced them - same issue (clicking). I believe the starboard is a bendix issue, but with both now clicking even with new batts, I'm stumped with what to do. Rebuild the starters or should I be looking at something else?