I'm having some issues with the starter on my 76 X-18. For the past few weeks, the starter would only engage occasionally when trying to start it, like once every 2 or 3 times, regardless of hot or cold engine conditions. The starter itself was rebuilt in mid-june, the battery was replaced in early July and has a full charge. All connections are clean and tight. When the ignition key is turned, theres nothing, just the drop in the needle on the voltmeter. I had the starter out and checked the solenoid on the bench, kicks out the bendix just fine and the starter turns freely. With the starter in the boat, I jumped from the battery stud on the starter to the solenoid stud and the engine turns over and starts fine. With the battery disconnected, I tested the starter circuit, and the switch appears to be working properly, but the starter won't engage even if I jump it at the switch. I'm kind of at a loss, and this weekend is the start of my week of vacation. Any ideas?