You check the trim relay? Follow your wire diagram. Contacts may be corroded. Sometimes on some motors the trim relay is jumped to more than just trim. Jmo. I've seen it be a major problem on my buddies motor. Take it out unplug battery clean it put it back in and reconnect. Sometimes it's just something as simple as that or the harness. I'd try that before getting a new motor. You should have a wiring layout in the back of your manual
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